Castillo de San Marcos National Monument

Crossing a dry moat, this drawbridge was the only way into the Castillo.
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.
Map showing location of park.
Castillo de San Marcos & Fort Matanzas to Reopen on Saturday, September 28, 2024, Following Hurricane Helene
Castillo de San Marcos National Monument will REOPEN to the public on Saturday, September 28, 2024. Fort Matanzas National Monument will REOPEN with Restrictions on Saturday, September 28, 2024.
Castillo de San Marcos & Fort Matanzas to Close on Wednesday, September 25, 2024, Due Tropical Storm Helene
Castillo de San Marcos and Fort Matanzas National Monuments will be CLOSED starting Wednesday, September 25, 2024, in anticipation of severe weather and potential impacts from Tropical Storm Helene.
Second Public Meeting on Seawall Rehabilitation Project
Castillo de San Marcos National Monument is planning a multimillion-dollar project to raise and rehabilitate the failing seawalls around the fort. The NPS is inviting public comment on this project from September 17 to October 15, 2024. A public meeting will be held on Tuesday, September 24, 2024, at 6:00 p.m.
Castillo de San Marcos seeks public input on plan to Raise and Rehabilitate the Fort’s Seawalls
Castillo de San Marcos National Monument is is planning a multimillion-dollar project to raise and rehabilitate the failing seawalls around the fort. The NPS is inviting public comment on this project from June 17 to July 17, 2024. A public meeting will be held on Tuesday, June 25, 2024, at 6:00 p.m.
Drawbridge entrance to the Castillo de San Marcos
Photo by NPS Photo
Furnace for heating cannon balls
Photo by NPS Photo
Four black iron cannon mounted on carriages line the walls of the Castillo.
Photo by NPS Photo
Re-enactors of the first Spanish period cover their ears while firing a cannon.
Photo by NPS Photo
Aerial view of the Castillo and the city of St. Augustine
Photo by NPS Photo