La Fortaleza © Jerrye & Roy Klotz MD
La Fortaleza was built in 1540 as a fortress to guard the entrance to the San Juan harbour, but later became the official Governor's residence. During succeeding centuries, the original structure has been remodelled and expanded, with a neoclassical façade being added in 1846 to leave the building with its palatial aspect. It is listed as a UNESCO World Heritage Site and is the oldest administrative mansion still in use in the New World.
Address: Fortaleza Street, Old San Juan