Castillo de San Marcos National Monument
attractions★ 4.7 (38,432)
Make time for the oldest masonry fortification in the continental United States. Built by Spain to defend Florida and the Atlantic trade route, the Castillo connects its surviving defenses with more than 450 years of cultural encounters.
From the Wayfind guide
The 1600s Spanish coquina fortress on Matanzas Bay anchors every trip: cannon-fire demonstrations, rampart views, and stone that has outlasted every flag flown over it. Adult entry runs about $15 and kids are free.
Read the full 10 Best Things to Do in St. Augustine This Summer (2026) →Map & parking
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