Castillo de San Felipe del Morro, Northwest end of San Juan, San Juan, San Juan Municipio, PR
Significance: This fort is one of the three defenses erected to protect Spain's first permanent colony in the present territory of the United States.
Unprocessed Field note material exists for this structure: FN-18
Unprocessed Field note material exists for this structure: N110
Survey number: HABS PR-48
Building/structure dates: 1539 Initial Construction
Building/structure dates: 1591 Subsequent Work
National Register of Historic Places NRIS Number: 66000930