• 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 »

Management

Did You Know?

1642 map showing the ancient coast of florida

The Castillo de San Marcos was originally constructed to defend Florida against pirates hunting the Spanish treasure fleets traveling along the Gulf Stream. Castillo de San Marcos National Monument, Florida