In the Season 2 finale "Ghost Hunters Return to Waverly Hills," Grant Wilson jumps at the chance to take his team of paranormal investigators to one of his favorite haunts, Waverly Hills Sanitorium in Louisville, Ky. In the ghostbusting community, the long-abandoned facility is widely regarded as one of the most haunted places on Earth. What makes the invitation even more provocative is that it comes as a call for help from the new owners.