Castillo de San Marcos Nat'l Monument - St. Augustine, Florida

The Castillo de San Marcos National Monument in St. Augustine, Florida. The fort is the oldest masonry fort in the continental U.S.; it was constructed by the Spanish between 1672 and 1695. The fort was besieged twice by the British but was never taken by force. It was added to the National Register of Historic Places in 1966.

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