This massive structure is three centuries old, and it looks every second of it. The fort was constructed of coquina, a soft limestone made of broken shells and coral. Built by the Spanish to protect St. Augustine from British raids (English pirates were handy with a torch), the fort was used as a prison during the Revolutionary and Civil wars. Park rangers provide an introductory narration, after which you're on your own to explore the moat, turrets, and 16-foot-thick walls. Garrison rooms depict the life of the era, and special cannon-firing demonstrations are held on weekends from Memorial Day to Labor Day. Children under 16 are admitted free and must be accompanied by an adult. Save the receipt, since admission is valid for seven days.
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