Standing on the seawall, looking along the ditch and the southeast wall. The east bastion (Bastion C) is in the distance. We're standing on the curve where the seawall turns to face on the south wall, adjacent to Bastion D.
This is one of a trove of photos and technical drawings in the National Park Service Historic Structure Report for Fort Jefferson.
This fort is spectacular. If you go to Key West, you owe it to yourself to take the 90 minute FastCat ride out there, some 70 miles west of the Keys. Once you're there, even though you're miles west of Florida and Cuba, you're still considered to be in the Atlantic Ocean (or maybe the Gulf of Mexico is north?). Climb up on top of the massive walls and all you see is ocean in every direction.
The water's like crystal. Very good snorkeling on the coral reefs that surround the fort.