National Parks / Castillo de San Marcos National Monument
Castillo de San Marcos National Monument
National Monument — FL
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.
Current Alerts
- Park ClosureConstruction for Seawall Project
Starting July 27, 2026, Castillo de San Marcos National Monument will begin construction to replace, raise and rehabilitate the park’s failing seawalls. The historic fort will remain accessible throughout the project. Some areas outside of the fort will be closed for safety.
- InformationFee Stations Credit Card Only
Fee Stations are only accepting credit cards for the purchase of entry tickets and passes.
Source: National Park Service.