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Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Interborough Rapid Transit Subway (Original Line), New York, New York County, NY

Interborough Rapid Transit Subway (Original Line), New York, New York ...

Significance: The IRT was New York City's first subway. Unprocessed Field note material exists for this structure: N508 Survey number: HAER NY-122 Building/structure dates: ca. 1904 Initial Construction

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River at Sixth Street, Pittsburgh, Allegheny County, PA

Three Sisters Bridges, Sixth Street Bridge, Spanning Allegheny River a...

Significance: The Three Sisters Bridges represent an adaptive engineering design response to political and technical concerns. County engineers successfully maneuvered around federally-mandated clearances, aest... More