Castillo De San Marcos National Monument • Florida

Drawbridge entrance to the Castillo de San Marcos

Furnace for heating cannon balls

Four black iron cannon mounted on carriages line the walls of the Castillo.

Re-enactors of the first Spanish period cover their ears while firing a cannon.

Aerial view of the Castillo and the city of St. Augustine

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.

Crossing a dry moat, this drawbridge was the only way into the Castillo.
NPS Photo

This furnace, in the water battery on the east side of the Castillo, heated cannonballs red hot to be fired at wooden vessels.
NPS Photo

The Castillo features both iron and bronze cannon and mortar from the period.
NPS Photo

Cannon firing demonstrations are scheduled five times a day every Friday, Saturday, and Sunday.
NPS Photo

the Castillo commands the northern edge of the heart of downtown St. Augsutine.
NPS Photo

Exhibit pane with text and flags in fort's casemate.

Review the menu of opportunities awaiting you.

Grass in foreground, splanish flag centered in image, chapel door and walls in background

Learn more about the Castillo's hours of operation.

Seawall on east side of the fort. Wall, palm trees, water, and sail boats in background.

Explore photos, history, education opportunities, and more.

image of castillo de san marcos with film type frame

Explore the many stories of Castillo de San Marcos with these short videos.

Evening program in the courtyard by candlelight

Check out our calendar to learn more about upcoming special events.

Black & White image of Castillo's well in 1875

The interior well of Castillo de San Marcos in 1875-1878. And a room with windows in the South West corner.

Image of gun deck with cannons, bell tower, water, and palm trees.

Learn about parking and entrance fees.

Wheel chair and service dog.

Learn more about accessibility at Castillo.

Field trip of students on gun deck near cannon and bell tower.

Learn about field trips, curriculum, distance learning, and more.

Map of park on park app .

Download the Official Park Mobile App.

Front Page of Park Brochure

Click here for a high resolution image

Front page of park brochure

Click here for high resolution image.

Last updated: March 16, 2026

Contact Info

Mailing Address:

1 South Castillo Drive
Saint Augustine, FL 32084

Phone:

904 829-6506

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