La Fortaleza and San Juan National Historic Site in Puerto Rico

La Fortaleza and San Juan National Historic Site in Puerto Rico is a World Heritage Site located in and near San Juan, Puerto Rico. It comprises a series of fortifications across two properties:
These structures were built between the 15th and 19th centuries to defend the city and harbor of San Juan, and are examples of European military architecture adapted to port cities on the American continent. La Fortaleza was the first defensive fortification built for the city. The historic site also includes Castillo de San Felipe del Morro, Castillo de San Cristóbal, El Cañuelo, and three-fourths of the old city wall.