Built in 1771, Fort Mifflin is the country’s only Revolutionary War battlefield that is still intact. There are 14 restored buildings on the grounds on the Delaware River and reportedly plenty of spirits from the past. Amongst the ghosts said to haunt the fort are a screaming woman whose cries are so loud that the Philadelphia police have been called to investigate, only to find no one there. Other characters in the local ghost stories include a faceless man wandering around the fort, a tour guide dressed in revolutionary garb and numerous children and dogs.