Attention class: There is an old VHS video that I checked out from the Harwood Heights public library. Its called "the ghosts of chicago" and its hosted by Richard Crowe. The video features our beloved BGC & it was made in 1986. Boy, has BGC changed since then! Hes the guy that did/does the chicago ghost tours.
I made a dvd copy of it. It shows the marker that moves by itself.