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One of the most prominent sites in St. Augustine is the Castillo de San Marcos, a fortification that was constructed by the Spanish beginning in 1672. Made from coquina — a unique sedimentary rock — this impressive structure witnessed numerous sieges but never fell during battle. The fort has changed hands multiple times, having flown the flags of Spain, Great Britain, the Confederate States of America, and the United States. Today, it serves as a National Monument and offers visitors the chance to explore its history and imagine the daily lives of those who once guarded its walls. The fort's entrance fee of $15 allows for a glimpse into its storied past and unmatched defensive architecture.