From National Monuments

Castillo de San Marcos National Monument

Know Before You Go

Designation: National Monument
State: FL
Park address: Saint Augustine, FL
Entrance fee: Per person: $15.00; Park annual pass: $45.00NPS data as of 2026-08-25

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Designation Date: 10/15/1924
Built by the Spanish in St. Augustine to defend Florida and the Atlantic trade route, Castillo de San Marcos National Monument preserves the oldest masonry fortification in the continental United States and interprets more than 450 years of cultural intersections.

Castillo de San Marcos National Monument