Fans of the paranormal have been given a glimpse behind the walls of a haunted prison where urban explorers have seen the faces of dead inmates.
The old Joliet prison opened its doors in 1858 and then housed 33 inmates before being run for two centuries in Illinois, US.
It was the scene of several murders and the first prison officer to be killed was Joseph Clark as its population grew to more than 1,000 inmates.
