• 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 »

Brochures

We have made a selection of our information brochures available to you as Adobe pdf documents. Just click on the brochure name to open it in a separate window or right click on it and select "Save Target As.." to download it directly to your computer.

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Official Park Unigrid

4th of July

British Garrison

British Night Watch

Change of Flags

Military Music

NPS History

Self-Guiding Tour

Siege of 1702

Territorial Florida

Thanksgiving

World War 2

Did You Know?

Bronze Spanish cannons look out over the city of St. Augustine

Black, or gun, powder is a mix of potassium nitrate, sulfur, and charcoal used as a propellant charge in cannons. Burning rapidly when ignited, it expands 600 times its volume creating pressures that can hurl a cannonball up to 3.5 miles! Castillo de San Marcos National Monument, Florida