Image: Fort Jefferson 4 wiki

Description: Undated photo of Fort Jefferson — located in the Gulf of Mexico about 70 miles west of Key West, Florida. The walkway from the boats leads into the Sally Port, the entrance to Fort Jefferson. Just above the Sally Port entrance is the casemate, or gun room, where Dr. Samuel A. Mudd, Edman Spangler, Samuel Arnold, and Michael O'Laughlen lived while imprisoned at Fort Jefferson. Note the six projections, or bastions, at the six corners of the fort. The ground level gun room in the bastion to the left of the Sally Port is the 'dungeon' where Dr. Mudd, Spangler, Arnold, O'Laughlen, and George St. Leger Grenfell were confined for three months following Dr. Mudd's unsuccessful escape attempt in September 1865. Image courtesy of federal HABS—Historic American Buildings Survey in Florida project. Library of Congress, Prints and Photographs Division, Historic American Buildings Survey (HABS) Reproduction Number FL-44-20. The Historic American Buildings Survey (HABS) is a program of the U.S. National Park Service. All HABS photos are in the public domain.
Title: Fort Jefferson 4 wiki
Credit: Courtesy Library of Congress, Prints and Photographs Division, Historic American Buildings Survey (HABS) Reproduction Number FL-44-20.
Author: U.S. Department of the Interior, National Park Service.
Permission: PD-USGOV-INTERIOR-HABS.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No