The Castillo de San Marcos is America’s only true medieval structure. The Spanish began construction in 1672, and it took 23 years to complete. It was constructed from coquina, an indigenous composition of bonded shells that can easily absorb the impact of a cannonball.
Throughout its long history, the Castillo de San Marcos has seen many bloody battles fought and many people lose their lives. As a result, it is now the haunting ground for a number of ghosts. They say if you place your ear on any wall of the fort, you can hear screams and sounds of fighting as though there is a battle being fought. There are reports of orb sightings, phantom smells, feelings of dread and wandering cold spots throughout the fort and surrounding property. Many people have captured ghostly images on their cameras and heard voices of the long dead recorded on their vacation videos.
Several people have reported seeing a soldier in the garb of a conquistador patrolling the top of the Castillo at night, long after the area has been cleared and closed for the day. More people have told stories of seeing and speaking to a young man dressed in like a British soldier, searching the area near the sea wall. He tells people he is searching for a ring he lost. Most people assume he is one of the many reenactors that wander the city until he vanishes before their eyes.