The Discovery Channel's "Ghost Adventures" is returning for a 29th season, and the first trailer is out. Paranormal investigators Zak Bagans, Aaron Goodwin, Billy Tolley and Jay Wasley are back to ghost-hunting, with investigations including investigation of an Arizona hotel connected to one of America's most violent gangsters, an Old West town thought to be cursed, and a former brothel overrun with dark spirit activity, as well as the legendary Los Angeles Hospital where thousands of deaths have reportedly left...something...wandering its abandoned halls. The series returns May 15; see the trailer below...