San Juan National Historic Site in San Juan, Puerto Rico, includes colonial-era forts, bastions, powder houses, and three fourths of the old city wall.
The site includes four features:
By a February 14, 1949 decree the site was established, and noted the need to protect the fortifications as monuments as well as preserve their historical and architectural value. Listed on the National Register of Historic Places on October 15, 1966.
On December 6, 1983 the park was added to the list of World Heritage Site. Only 12 national park areas in the United States are considered World Heritage Sites.