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

    Castillo De San Marcos

    National Monument Florida

There are park alerts in effect.
show Alerts »
  • 4th Of July Information

    The Castillo’s parking lot will be closed at 7:30 pm and will remain closed for the duration of the fireworks event. Alcoholic beverages are prohibited. Use and/or possession of all fireworks (including sparklers) are prohibited. All fires are prohibited.


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