View of moat wallDry Tortugas National Park; National Park ServicePhoto of large underwater hole. Checked at medium tide today at approx 7 ft. deep where [illegible] piling
Aerial of South fort bastion and moatDry Tortugas National Park; National Park ServiceFort Jefferson; A south fort bastion & the moat at Fort Jefferson; Leo A. Frank; 3/28/37
Outer wall of Fort JeffersonDry Tortugas National Park; National Park ServiceFort Jefferson wall [illegible] broken moat wall caused by a hurricane; 3/28/37