• Cannon firing on the gundeck of the Castillo de San Marcos

    Castillo De San Marcos

    National Monument Florida

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  • Summer Weather

    Afternoon Thunderstorms can create dangerous amounts of lightning strikes. If Lightning is visible from the Castillo, Gundeck closures will take place. Click this link for the local weather forcast. More »

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Did You Know?

Castillo casemate, or room, which was primarily used for storage.

The Castillo de San Marcos is built with the unique limestone, "coquina". Made of many tiny shell fragments and sand lightly bound together with calcite, it has survived cannon balls and hurricanes but is very fragile to human contact. Castillo de San Marcos National Monument, Florida