What would have been the entrance to the casemate in which Jefferson Davis was imprisoned. From the marker over the door:

In this casemate Jefferson Davis, President of the Confederate States,
was confined, May 22 - October 2 1865. As his health suffered in the casemate,
he was removed to Carroll Hall in the fortress, where he remained from October, 1865,
until May, 1867, when he was released on bail. He was never brought to trial.

The plaque to the right of the window was placed by the United Daughters of the Confederacy in 1939 in honor of Dr. John J. Craven, who was instrumental in convincing Fort Monroe's commanding officer, General Nelson A. Miles, to move the casemated Mr. Davis to slightly more pleasant confinement.