In the past, hospitals were often overcrowded, dirty, and the treatments were sometimes harmful--or deadly. Is this why so many old hospitals are said to be haunted? Do the spirits of the dead linger in places of suffering? There is a devoted group of people who want to find out. These ghost hunters, also known as paranormal investigators, gather evidence to prove that ghosts are real. Look inside to read all about so-called haunted hospitals. And follow paranormal investigators who seek to uncover the truth about ghosts.