• 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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The Cannons of the Castillo

Click on the links below to view picture postcards of the cannons currently on display at the Castillo. (You'll need the latest version of Adobe Acrobat Reader to view these files. You can download it for free on Adobe's web site.)

Postcard 1 - Spanish Iron 3lb

Postcard 2 - Spanish Bronze 2lb

More to come!

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