Inside the dark interior of the fort. What once served as a naval base to cut off foreign attack was converted into a civil war prison housing the most dangerous US criminals. #florida #floridakeys #visitflorida #abandonedplaces #canonusa #beach #thenorthface #patagonia #fjallraven #moodygrams #illgrammers #visit #travelphotography #drytortugas #hiketheglobe #birdphotography #traveltheworld #travel #travelchannel #usa #expedia #tripadvisor #kayak #canon_photos #solotravel #adventure #yourshotphotographer #keywest