The Casemate Museum is a must-see for Civil War buffs; Confederate president Jefferson Davis was imprisoned in the bowels of Fort Monroe in 1865 after being captured in Georgia. The accusation that he had participated in Lincoln's assassination was disproved, and Davis was released in 1867. Located at the tip of a peninsula and surrounded by a moat, the fort was built between 1819 and 1834 and is the largest brick fort in the United States. Robert E. Lee served as second in command of the construction detachment in 1831 when he was a young officer in the Army Corps of Engineers, and Edgar Allen Poe spent 16 months here in 1828 and 1829 as an enlisted man. During the Civil War it became known as "Freedom Fortress" as escaped slaves who entered its gates were considered to be "contrabands of war" and thus free. The dungeonlike casemates, where Davis was held, were designed as storage for seacoast artillery. After 1861, they were modified to serve as living quarters for soldiers and their families. You'll need about 45 minutes in the museum to view displays of military memorabilia and Davis's sparsely furnished quarters (his intricately carved pipe -- an egg-shaped bowl clenched in an eagle's claw -- is outside the door). Tours can be arranged in advance by contacting the museum. You will need to show a picture ID in order to get into Fort Monroe.