Florida.

Castillo de San Marcos is St. Augustine’s coquina fort overlooking Matanzas Bay. An interior visit brings together defensive architecture and historical interpretation, with the ramparts adding a view of the water.

The fort’s material and defensive form make colonial history visible. An interior visit and the view from the ramparts provide different ways to understand its relationship to the bay. Looking at the fort from within its defensive spaces helps make its layout understandable, while the bay outlook shows the setting those defenses were designed to address.

Construction began in 1672 after a destructive privateer raid exposed the weakness of St. Augustine's defenses. The Spanish replaced vulnerable wooden fortifications with masonry built from coquina, a local shellstone. During the English siege of 1702, this material absorbed cannon impacts while soldiers and townspeople sheltered inside. A Spanish fleet arriving from Havana helped end the siege, but the town suffered extensive destruction. The fort's changing names trace Florida's transfers between governments. Under British rule it became Fort St. Mark; under the United States it became Fort Marion. The original Spanish name returned in 1942. Its American history also includes imprisonment of Native people, among them Seminoles and members of Plains tribes. That later role complicates the story of a structure first built to protect a colonial town: the same walls that offered refuge also confined people displaced by expanding American power.

• Ramparts
• Matanzas bay views

Follow the interior interpretation before going to the ramparts.

Use NPS access information for the fort itself when planning around the surrounding city.