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Natural bridge, on the trail leading to Vernal Fall

[Trail from woods to wooden bridge]

Bridge over Porcupine Creek, Skaguay Trail

Middle Lake and bridge on '97 trail near Log Cabin, Skagway, Alaska

Below Bear Mountain bridge, Appalachian Trail, [New York]

Blue Bridge, Appalachian Trail

Appalachian Trail, Juniata River Crossing, Pennsylvania

Alabama welcomes the newest addition to the Robert Trent Jones Golf Trail, Ross Bridge, located in Hoover near Birmingham, Alabama

Alabama welcomes the newest addition to the Robert Trent Jones Golf Trail, Ross Bridge, located in Hoover near Birmingham, Alabama

Alabama welcomes the newest addition to the Robert Trent Jones Golf Trail, Ross Bridge, located in Hoover near Birmingham, Alabama

Alabama welcomes the newest addition to the Robert Trent Jones Golf Trail, Ross Bridge, located in Hoover near Birmingham, Alabama

Alabama welcomes the newest addition to the Robert Trent Jones Golf Trail, Ross Bridge, located in Hoover near Birmingham, Alabama

Alabama welcomes the newest addition to the Robert Trent Jones Golf Trail, Ross Bridge, located in Hoover near Birmingham, Alabama

Alabama welcomes the newest addition to the Robert Trent Jones Golf Trail, Ross Bridge, located in Hoover near Birmingham, Alabama

Alabama welcomes the newest addition to the Robert Trent Jones Golf Trail, Ross Bridge, located in Hoover near Birmingham, Alabama

Alabama welcomes the newest addition to the Robert Trent Jones Golf Trail, Ross Bridge, located in Hoover near Birmingham, Alabama

[Part of Robert Summers's sculpture, "The Waco Chisholm Trail Heritage," near the historic Waco Suspension Bridge, now a pedestrian and bicyclists' bridge across the Brazos River in Waco, Texas]

Part of Robert Summers's sculpture, "The Waco Chisholm Trail Heritage," near the historic Waco Suspension Bridge, now a pedestrian and bicyclists' bridge across the Brazos River in Waco, Texas

Bethlehem Steel Corporation, South Bethlehem Works, Open Hearth No. 3, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Rush's Mill Bridge, Spanning Plum Creek at North end of Union Canal Bicycle & Walking Trail, Sinking Spring, Berks County, PA

Rush's Mill Bridge, Spanning Plum Creek at North end of Union Canal Bicycle & Walking Trail, Sinking Spring, Berks County, PA

Rush's Mill Bridge, Spanning Plum Creek at North end of Union Canal Bicycle & Walking Trail, Sinking Spring, Berks County, PA

Rush's Mill Bridge, Spanning Plum Creek at North end of Union Canal Bicycle & Walking Trail, Sinking Spring, Berks County, PA

Rush's Mill Bridge, Spanning Plum Creek at North end of Union Canal Bicycle & Walking Trail, Sinking Spring, Berks County, PA

Rush's Mill Bridge, Spanning Plum Creek at North end of Union Canal Bicycle & Walking Trail, Sinking Spring, Berks County, PA

Rush's Mill Bridge, Spanning Plum Creek at North end of Union Canal Bicycle & Walking Trail, Sinking Spring, Berks County, PA

Rush's Mill Bridge, Spanning Plum Creek at North end of Union Canal Bicycle & Walking Trail, Sinking Spring, Berks County, PA

Rush's Mill Bridge, Spanning Plum Creek at North end of Union Canal Bicycle & Walking Trail, Sinking Spring, Berks County, PA

Rush's Mill Bridge, Spanning Plum Creek at North end of Union Canal Bicycle & Walking Trail, Sinking Spring, Berks County, PA

Aldrich Towing-Path Change Bridge, Spanning New York State Heritage Trail, Aqueduct Park (moved from Macedon, NY), Palmyra, Wayne County, NY

Aldrich Towing-Path Change Bridge, Spanning New York State Heritage Trail, Aqueduct Park (moved from Macedon, NY), Palmyra, Wayne County, NY

Aldrich Towing-Path Change Bridge, Spanning New York State Heritage Trail, Aqueduct Park (moved from Macedon, NY), Palmyra, Wayne County, NY

Aldrich Towing-Path Change Bridge, Spanning New York State Heritage Trail, Aqueduct Park (moved from Macedon, NY), Palmyra, Wayne County, NY

Aldrich Towing-Path Change Bridge, Spanning New York State Heritage Trail, Aqueduct Park (moved from Macedon, NY), Palmyra, Wayne County, NY

Structures on Old National Trail, Bridge, U.S. Route 40, Pittsburgh, Allegheny County, PA

Structures on Old National Trail, Bridge, U.S. Route 40, Pittsburgh, Allegheny County, PA

Rocky Neck Park Trail Bridge, Foot trail over New Haven Railroad, Old Lyme, New London County, CT

Rocky Neck Park Trail Bridge, Foot trail over New Haven Railroad, Old Lyme, New London County, CT

Rocky Neck Park Trail Bridge, Foot trail over New Haven Railroad, Old Lyme, New London County, CT

Rocky Neck Park Trail Bridge, Foot trail over New Haven Railroad, Old Lyme, New London County, CT

Rocky Neck Park Trail Bridge, Foot trail over New Haven Railroad, Old Lyme, New London County, CT

Rocky Neck Park Trail Bridge, Foot trail over New Haven Railroad, Old Lyme, New London County, CT

Blackfoot River Crossing Bridge, North Trail Canyon Road, approximately 12 miles northeast of Soda Springs, Soda Springs, Caribou County, ID

Blackfoot River Crossing Bridge, North Trail Canyon Road, approximately 12 miles northeast of Soda Springs, Soda Springs, Caribou County, ID

Blackfoot River Crossing Bridge, North Trail Canyon Road, approximately 12 miles northeast of Soda Springs, Soda Springs, Caribou County, ID

Blackfoot River Crossing Bridge, North Trail Canyon Road, approximately 12 miles northeast of Soda Springs, Soda Springs, Caribou County, ID

Blackfoot River Crossing Bridge, North Trail Canyon Road, approximately 12 miles northeast of Soda Springs, Soda Springs, Caribou County, ID

Blackfoot River Crossing Bridge, North Trail Canyon Road, approximately 12 miles northeast of Soda Springs, Soda Springs, Caribou County, ID

Blackfoot River Crossing Bridge, North Trail Canyon Road, approximately 12 miles northeast of Soda Springs, Soda Springs, Caribou County, ID

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Grande Ronde River Bridge, Sprnning Grande Ronde River on Old Oregon Trail Highway (Oregon Route 6), La Grande, Union County, OR

Stanley Brook Bridge, Spanning Stanley Brook, Stanley Brook Motor Road, & Seaside Trail on Barr Hill-Day Mountain Carriage Road, Seal Harbor, Hancock County, ME

Stanley Brook Bridge, Spanning Stanley Brook, Stanley Brook Motor Road, & Seaside Trail on Barr Hill-Day Mountain Carriage Road, Seal Harbor, Hancock County, ME

Stanley Brook Bridge, Spanning Stanley Brook, Stanley Brook Motor Road, & Seaside Trail on Barr Hill-Day Mountain Carriage Road, Seal Harbor, Hancock County, ME

Stanley Brook Bridge, Spanning Stanley Brook, Stanley Brook Motor Road, & Seaside Trail on Barr Hill-Day Mountain Carriage Road, Seal Harbor, Hancock County, ME

Stanley Brook Bridge, Spanning Stanley Brook, Stanley Brook Motor Road, & Seaside Trail on Barr Hill-Day Mountain Carriage Road, Seal Harbor, Hancock County, ME

Stanley Brook Bridge, Spanning Stanley Brook, Stanley Brook Motor Road, & Seaside Trail on Barr Hill-Day Mountain Carriage Road, Seal Harbor, Hancock County, ME

Bethlehem Steel Corporation, South Bethlehem Works, Crucible Steel Plant, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Crucible Steel Plant, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Blast Furnace "A", Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Blast Furnace "A", Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Blast Furnace "A", Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Rolling Mill, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Rolling Mill, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Rolling Mill, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Rolling Mill, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Rolling Mill, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Bethlehem Steel Corporation, South Bethlehem Works, Rolling Mill, Along Lehigh River, North of Fourth Street, West of Minsi Trail Bridge, Bethlehem, Northampton County, PA

Structures on Old National Trail, Bridge, U.S. Route 40, Pittsburgh, Allegheny County, PA

Structures on Old National Trail, Bridge, U.S. Route 40, Pittsburgh, Allegheny County, PA

The Horse Ranch, Minam River Horse Trail Bridge, Eagle Cap Wilderness Area, Joseph, Wallowa County, OR

The Horse Ranch, Minam River Horse Trail Bridge, Eagle Cap Wilderness Area, Joseph, Wallowa County, OR

The Horse Ranch, Minam River Horse Trail Bridge, Eagle Cap Wilderness Area, Joseph, Wallowa County, OR

The Horse Ranch, Minam River Horse Trail Bridge, Eagle Cap Wilderness Area, Joseph, Wallowa County, OR

Great Smoky Mountains National Park Roads & Bridges, Cataloochee Trail & Turnpike, Between TN-NC state boundary & Cataloochee, Gatlinburg, Sevier County, TN

Great Smoky Mountains National Park Roads & Bridges, Cataloochee Trail & Turnpike, Between TN-NC state boundary & Cataloochee, Gatlinburg, Sevier County, TN

Great Smoky Mountains National Park Roads & Bridges, Cataloochee Trail & Turnpike, Between TN-NC state boundary & Cataloochee, Gatlinburg, Sevier County, TN

Canyon Bridge, North Rim Trail spanning Jay Creek, Lake, Teton County, WY

Canyon Bridge, North Rim Trail spanning Jay Creek, Lake, Teton County, WY

Canyon Bridge, North Rim Trail spanning Jay Creek, Lake, Teton County, WY

Canyon Bridge, North Rim Trail spanning Jay Creek, Lake, Teton County, WY

Great Smoky Mountains National Park Roads & Bridges, Roaring Fork Motor Nature Trail, Between Cherokee Orchard Road & U.S. Route 321, Gatlinburg, Sevier County, TN

Great Smoky Mountains National Park Roads & Bridges, Roaring Fork Motor Nature Trail, Between Cherokee Orchard Road & U.S. Route 321, Gatlinburg, Sevier County, TN

Great Smoky Mountains National Park Roads & Bridges, Roaring Fork Motor Nature Trail, Between Cherokee Orchard Road & U.S. Route 321, Gatlinburg, Sevier County, TN

Great Smoky Mountains National Park Roads & Bridges, Roaring Fork Motor Nature Trail, Between Cherokee Orchard Road & U.S. Route 321, Gatlinburg, Sevier County, TN