A ghost hunter's guide to the most haunted places in America

Surveys a wide number of places across America said to be haunted, such as the Trans-Allegheny Lunatic Asylum, haunted by spirits that were lobotomized; the Shanghai Tunnels, where the spirits of kidnapped men and women, who were forced to work, still linger; and Tombstone, where The Birdcage Theatre hosts ghosts on stage.