Hundreds of witnesses have encountered the paranormal in Gettysburg, PA. What do these spirits want us to know about the bloodiest battle ever fought on North American soil? Watch this video [43:00] to learn more.

America is often haunted by its past, which explains why ghost stories have always been an integral part of this nation's oral history. Viewers will visit some of the darkest, scariest corners of the country -- from the battlefields of...