1842 map of the Castillo de San Marcos, then known as Fort Marion
Drawing of the fort much like engineering prints for building a home.
Image shows room layout and interior casemates.
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Image
Castillo de San Marcos National Monument, Code: CASA
Castillo de San Marcos National Monument, St. Johns County, Florida Latitude: 29.8978996276855, Longitude: -81.3122024536133