Calcium buildup on floor after years of water seepage. Fort Jefferson, Dry Tortugas National Park, FL. © 2011 Kenneth R. Sheide
Garden Key Lighthouse atop Fort Jefferson in the Dry Tortugas, FL. © 2011 Kenneth R. Sheide
View of Gulf of Mexico from atop Fort Jefferson, Dry Tortugas National Park, FL. © 2011 Kenneth R. Sheide
