Fort Delaware State Park
Civil War fort Pea Patch Island (via Delaware City), DE
Completed in 1859, Fort Delaware held thousands of Confederate prisoners during the Civil War, and many died there of disease. Visitors and reenactors report voices, footsteps and figures in uniform, and the park hosts paranormal tours in the fall.
Visiting: Reached by seasonal ferry from Delaware City, with living history programs and fall paranormal tours; check Delaware State Parks for schedules.