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 seeks public input on plan to Raise and Rehabilitate the Fort’s Seawalls
The National Park Service (NPS) is planning a multimillion- dollar project to raise and rehabilitate the failing seawalls at Castillo de San Marcos National Monument. Funded by the 2023 Disaster Supplement bill, this project aims to repair damage from storms and enhance resiliency to create an optimal visitor experience and improve safety while minimizing potential impacts on natural and cultural resources.
Castillo de San Marcos National Monument Becomes First National Park to Earn Certified Autism Center™ Designation
Castillo de San Marcos National Monument joins a growing number of tourism and recreation-related organizations in northeast Florida to be awarded the Certified Autism Center™ designation by The International Board of Credentialing and Continuing Education Standards (IBCCES).
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