Explore Castillo de San Marcos with Stanza's GPS-triggered offline audio guide.

Castillo de San Marcos National Monument is a large masonry fort built by the Spanish in the 17th century. Located in St. Augustine, Florida, it served as a vital defensive outpost and is now preserved as a historic site and history museum.
The only entrance to the fortress, featuring the heavy defensive gates and the Spanish royal identity.

Walk across the drawbridge toward the Sally Port, the only way into this impenetrable stronghold, designed to keep the most determined attackers at bay.
The central courtyard that served as a refuge for the entire population of St. Augustine during major sieges.

Step into the Plaza de Armas, the open courtyard that served as the beating heart of the fortress during peace and a refuge during war.

This strategic map reveals how the fort’s location and impenetrable walls forced the British to retreat in one of the city's most desperate hours.
A somber look at the fort's 19th-century role as a military prison for Native American leaders and tribes.

The heavy door marked 'Carcel' signals a shift in the fort's history, from a defensive stronghold to a place of incarceration under United States rule.

This somber history of incarceration includes the imprisonment of Seminole leaders, highlighting the fort's role in the conflicts of the 19th century.
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