St. Augustine, Florida, is famous for its historical Spanish architecture, including the Castillo de San Marcos, the oldest masonry fort in the continental United States.

Founded in 1565 by Spanish explorers, St. Augustine is the oldest continuously occupied European-established settlement in the U.S. The city’s historic district showcases Spanish colonial buildings, cobblestone streets, and landmarks such as the Castillo de San Marcos, a fortress built in the 17th century to protect the area. St. Augustine's rich history and well-preserved architecture make it a unique and popular destination.