Castillo de San Marcos: Exploring the Oldest Masonry Fort in St. Augustine, Florida's Colonial History

Discover the Castillo de San Marcos, the oldest masonry fort in the United States, located in historic St. Augustine, Florida. Built by the Spanish in 1672 from coquina stone, this star-shaped fort played a vital role in colonial and military history. Designated as a National Monument, the Castillo—formerly known as Fort Marion—features well-preserved bastions, a moat, and scenic views of Matanzas Bay. Visitors can enjoy cannon demonstrations, ranger-led tours, and living history reenactments while exploring the fort’s unique Spanish colonial architecture. A must-see destination for history enthusiasts and tourists alike.