Along the western shore of Matanzas Bay stands the Castillo de San Marcos. Constructed from rough, seashell-laced coquina stone, this star-shaped fortress has loomed over St. Augustine for more than three centuries—an enduring symbol of Spanish colonial ambition in what would become the oldest city in the continental United States.

Built in the wake of a violent pirate raid, the Castillo was designed to be impenetrable—and history has proven it to be just that. It has never fallen to an enemy force. Yet the fort’s legacy is not merely one of military strength. Over the years, it has served as a prison, a staging ground for colonial conflict, and later, a site of Indigenous captivity and forced assimilation.

And according to legend, those centuries of violence, betrayal, and loss have left behind something more than just scars. Some say the Castillo de San Marcos is haunted—its walls echoing with the scent of a vanished woman, the footfalls of forgotten soldiers, and even the drifting head of a once-proud Seminole warrior.

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