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.
Official NPS page →Current Alerts (2)
Construction 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.
Fee Stations Credit Card Only
Fee Stations are only accepting credit cards for the purchase of entry tickets and passes.
Entrance Fees
The Castillo de San Marcos is considered to be a "walk-in" park. The entrance fee applies to each individual. Tickets are not transferable and cannot be given to other guests. Adults (Age 16 and above) entrance is $15.00 - valid for 7 consecutive days. Children (age 15 and under) are admitted free of charge but must be accompanied by an adult. Only credit and debit cards are accepted for payment. The Golden Access and Age Passports; the Castillo Annual Pass; and the Interagency Access, Annual, Military, and Senior Passes are honored for free admission in accordance with the terms specified on the card. Park passes provide free entry for the pass holder and 3 adult guests (age 16 and above). Children (age 15 and under) are free. All passes must be presented with a valid driver's license or state ID. The National Park Service offers free admission to everyone on special fee free days.
Pass covers entrance fees only at Castillo de San Marcos National Monument. Pass allows one passholder to print and sign their name and is valid for 12 months through the month of purchase. Pass covers the passholder and three additional adults (16 and over) when entering the Castillo.
Source: National Park Service.