Castillo de San Marcos National Monument
About
The Castillo de San Marcos is the oldest masonry fort in the continental United States, constructed by the Spanish between 1672 and 1695 to protect their treasure fleets. Built out of a rare, shock-absorbing limestone called coquina (composed of ancient broken shells), the fort successfully withstood multiple British sieges without ever being captured in battle. Today, it stands as a dramatic waterfront monument offering spectacular views of the Matanzas Bay and a deep window into colonial military history.
Highlights
What makes this place special
The Gun Deck
The top tier of the fort, offering panoramic views of the bay, historic city skyline, and rows of formidable historic cannons.
The Casemates
The vaulted interior rooms that once served as barracks, gunpowder storage, and prison cells during various conflicts.
Live Cannon Firings
Historic weapons demonstrations conducted by rangers and volunteers dressed in period-accurate Spanish military uniforms.
Things to Know
- •National Parks Passes (such as the America the Beautiful pass) are accepted here for free entry.
- •The parking lot directly in front of the fort is small, metered, and fills up very quickly on weekends and holidays.
- •The stairs leading up to the top gun deck are steep and made of historic stone, so watch your step and wear comfortable shoes.
