Castillo de San Marcos
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Stroll along the cobblestone streets of St. Augustine, America's Oldest City, and you'll find yourself transported back in time. Here, amidst the charming cafes and Spanish colonial architecture, stands a stoic guardian – the Castillo de San Marcos National Monument. This colossal stone fortress, the oldest masonry fort in the continental United States, whispers tales of conquest, battles, and resilience.

What to Know 

Standing sentinel over Matanzas Bay, the Castillo de San Marcos National Monument boasts a rich history that stretches back centuries. Located at 1 S Castillo Dr, St. Augustine, FL 32084, this imposing fortress is open daily from 9:00 AM to 5:00 PM. While there is an entrance fee, consider grabbing a National Park Pass for access to this and other captivating National Park Service sites. Deepen your exploration with a ranger-led tour offered throughout the day, or unlock Castillo's hidden stories with St. Augustine Tours by Tripshepherd.

How to Get There

St. Augustine is easily accessible by car, train, or bus. If you're driving, navigate to 1 S Castillo Dr and follow signs for the Castillo de San Marcos National Monument. Parking is available nearby. The city also offers trolley tours that make a stop at the Castillo. Consider booking Tripshepherd’s Best of St. Augustine with a Scenic Cruise to elevate your St. Augustine adventure.

Best Time to Visit

Spring (March-May) and fall (September-November) offer pleasant weather and manageable crowds. Winter brings mild temperatures, while summer can be hot and humid. 


Awe-Inspiring Architecture:

The Castillo's imposing coquina walls, a type of local limestone, rise majestically from the ground. Explore the fort's intricate network of tunnels, chambers, and gun decks, each offering a glimpse into its defensive capabilities.

Panoramic Views:

Climb to the rooftop parapet and be rewarded with breathtaking vistas of Matanzas Bay. Imagine Spanish soldiers keeping watch for approaching enemies from this vantage point.

Exhibits and Living History:

Interactive exhibits bring the fort's history to life. Witness living history demonstrations where costumed interpreters portray Spanish soldiers and civilians.

Family-Friendly Activities:

Ranger-led programs and Junior Ranger activities engage young minds, making history come alive for the whole family.

Discover hidden gems and fascinating stories - plan your St. Augustine adventure today!


Military Prowess:

Constructed in the 17th century by the Spanish Empire, the Castillo was designed to protect the city of St. Augustine from attack. Its formidable walls withstood numerous threats, including raids by Native American tribes, British forces during the American Revolution, and the Seminole Wars.

Changing Hands:

The Castillo has flown the flags of three nations – Spain, Great Britain, and the United States. Following Florida's cession to the U.S. in 1821, the fort was renamed Fort Marion and served as a military prison during the American Civil War.

National Monument Status:

In 1924, the Castillo was declared a National Monument, preserving its historical significance for generations to come. Today, it stands as a testament to Florida's rich cultural heritage.


The Castillo de San Marcos isn't just a fortress; it's a testament to centuries of Florida's story. Born in 1672 as a Spanish defense against threats, its imposing coquina walls withstood battles with Native Americans and British assaults. Following Florida's transfer to the U.S., the Castillo, renamed Fort Marion, transitioned to a military prison, housing figures like Osceola during the Seminole Wars. Recognized for its historical significance, it became a National Monument in 1924, standing today as a monument to Florida's rich past.

The Castillo de San Marcos embodies the vibrant tapestry of St. Augustine's past. Imagine the thunderous roar of cannon fire echoing across the bay, Spanish soldiers patrolling the ramparts, and prisoners confined within the fort's walls. A visit to the Castillo is a journey through time, offering a deeper understanding of the city's struggles and triumphs.