Ghost Hunters Map The Chicago Ghost Hunters Collective (CGHC) is a small group of four professional ghost hunters -Doug, Kathy, Steve, and Patty who bring a diverse background of experiences and share a unique rapport at collecting evidence for such notable sites as Waverly Hills Sanatorium, Ohio State Reformatory (Mansfield), and numerous other locations and private residences in Illinois, Indiana, Wisconsin, Ohio and Kentucky. For inquiries to private paranormal investigations, please feel free to contact us. We book several investigations every year.