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Castillo de San Marcos National Monument
Castillo de San Marcos National Monument

Castillo de San Marcos National Monument

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Free admission

St. Augustine’s Castillo de San Marcos National Monument is the oldest masonry fort in the United States and the only intact 17th-century fort. Constructed by the Spanish in 1672 to protect their New World territories, it eventually passed to the British and Americans, and it played a crucial role in the Civil and Spanish–American wars.

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