Drawbridge entrance to the Castillo de San Marcos
Crossing a dry moat, this drawbridge was the only way into the Castillo. NPS Photo

Castillo de San Marcos National Monument

National Monument · Florida · National Park Service

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.

Plan your visit

Know before you go

Phone
9048296506
Official site
www.nps.gov
Managed by
National Park Service

Getting there

Directions on Google Maps →

What's here

Highlights: Architecture and Building · Forts · Hispanic American Heritage · Maritime · Coastal Defenses · Military · Artillery · Monuments and Memorials · Wars and Conflicts · Colonial/European Contact Conflicts

Activities & features: Living History · Historic Weapons Demonstration · Junior Ranger Program · Park Film

Photos

  • Furnace for heating cannon balls
    NPS Photo
  • Four black iron cannon mounted on carriages line the walls of the Castillo.
    NPS Photo
  • Re-enactors of the first Spanish period cover their ears while firing a cannon.
    NPS Photo
  • Aerial view of the Castillo and the city of St. Augustine
    NPS Photo

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Sources: National Park Service, Google Places · updated 2026-08-12