In Gettysburg, Pennsylvania, the site of epic battles during the American Civil War, witnesses claim to have seen the ghosts of soldiers.

Serial killer H.H. Holmes' Chicago hotel, built complete with gas chambers, trapdoors, and acid vats, is famous as a house of horrors.

The Pennhurst State School and Hospital in Pennsylvania is haunted by the spirits of neglected patients and abusive employees, inhabitants from the structure's earlier incarnation as an institution for physically and mentally disabled individuals.

Portland area antiques dealer Kevin Mannis buys an unassuming wine box, only to see it unleash paranormal activity upon a string of owners.

The Mad Butcher of Kingsbury Run stalks 1930s Cleveland's shantytowns, and the restless spirits of his murder victims offer clues to his identity.

The restless spirits of the innocent haunt four locations connected to the witch trials conducted in Salem, Massachusetts, in 1692.