Fort Humboldt is haunted by a former post commander who died of malaria in 1859. His apparition can be seen looking out the window of the fort’s hospital. Activity includes large, heavy objects being moved across the floor at night, lights turning on and off, objects and falling. Such occurrences started being reported during the 1950s, and began happening on a regular basis after 1993.
Now a state park, Fort Delaware served as a prison for Confederate soldiers during the Civil War. Workers and tourists alike have seen ghosts, felt cold spots, and heard disembodied voices. The ghost of a Civil War soldier has been reported watching groups of tourists from the upper ramparts. The fort, which is located on an island, also has a cemetery for soldiers who died of typhus and malaria, which is supposedly haunted as well.