San Juan National Historic Site.

 The fortification system in San Juan, Puerto Rico, was built by the Spaniards in the early 16th century.  It is the oldest European construction in the United States and one of the oldest in the 'NewWorld'.  the forts protected the entrance of the San Juan Bay and allowed Spain to control access and commerce into the Caribbean until the Spanish-American War in 1898. 

 

 

San Juan National Historic Site protects Fort San Felipe del Morro Fort San Cristobal ( the largest fortification built by the Spaniards in America), Fort San Juan de la Cruz and more than two miles of city wall. Projecting strength and power, the forts of Old San Juan are some of the finest examples of Spanish military engineering in the United States.  It is also a World Heritage Site......check another one off the list!!