Fort Jefferson from the airClearly, sea level rise and higher storm surges threaten Fort Jefferson in Dry Tortugas National… https://www.rawpixel.com/image/4039703/photo-image-ocean-nature-beachFree Image from public domain licenseFort Jefferson moat and wallThe Gulf of Mexico laps against the moat wall protecting Fort Jefferson. Original public domain… https://www.rawpixel.com/image/4039722/photo-image-person-sea-buildingFree Image from public domain licenseCoral Reef at Dry Tortugas National Park. Original public domain image from Flickr https://www.rawpixel.com/image/4029678/photo-image-ocean-nature-seaFree Image from public domain licenseCoral Reef at Dry Tortugas National Park. Original public domain image from Flickr https://www.rawpixel.com/image/4029629/photo-image-ocean-nature-seaFree Image from public domain license