![Close-Up View of Coquina which Forms the Walls of Castillo de San Marcos](https://etc.usf.edu/clippix/pix/close-up-view-of-coquina-which-forms-the-walls-of-castillo-de-san-marcos-2_medium.jpg)
Close-Up View of Coquina which Forms the Walls of Castillo de San Marcos
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