Cannon at corner of Fort Jefferson, Dry Tortugas National Park, FL. © 2011 Kenneth R. Sheide

View of empty casemates at Fort Jefferson, Dry Tortugas National Park, FL. © 2011 Kenneth R. Sheide

Brick rubble window view of Gulf of Mexico. Fort Jefferson, Dry Tortugas National Park, FL. © 2011 Kenneth R. Sheide