The stone fortress on Pea Patch Island in the Delaware River, built before the Civil War and turned into a prison camp that held thousands of Confederate soldiers in brutal, disease-ridden conditions; many died and lie across the river at Finn’s Point. Reached by ferry and run as a living-history park, it is called one of the most haunted places in the state, and the ghost hunts are an institution.
Pea Patch Island (New Castle County, DE)
See it on the map
Other places on the map within a couple of hours.