Do you believe in ghosts? Richard Crowe says he does—and he's got plenty of spooky tales to back him up! Known as the Midwest's original full-time professional ghost hunter, Richard says his hometown of Chicago is a hotbed for paranormal activity—and perhaps the single most haunted city in the United States. Dr. Oz talks with Richard about the origins of Halloween, Chicago hauntings and more secrets from the unknown.

Back in 1973, Richard led the world's first bus tour of haunted places. Hundreds lined up to learn more about Chicagoland's ghosts, and Richard says he's been conducting the popular tour ever since. In fact, he's devoted his career to the study of ghosts, hauntings and other supernatural phenomena. "I believe there's something out there—as to exactly what it all means and what it's all about, I'm still searching, but I believe that there's a lot of stuff beyond our current level of knowledge and science," Richard says.