For their 100th episode, Zak, Nick and Aaron visit St. Louis to investigate the notorious Exorcist House, the site of the most famous possession in paranormal history, which was later portrayed in a critically acclaimed book and movie. The guys dig even deeper to learn about the original exorcism that occurred on March 16, 1949.

Ghost Adventures travels to Idaho to visit the Lava Hot Springs Inn, a former sanatorium turned hotel. Once used to treat soldiers suffering from nightmarish effects, the mineral baths act as a conductor for paranormal activity.