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Castillo de San Marcos National MonumentPanoramic view of the Castillo circa 1880
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Castillo de San Marcos National Monument
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Then & Now: The Castillo

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

Did You Know?
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

Last Updated: September 19, 2006 at 15:38 EST