The St. Peter Regional Treatment Center in St. Peter, MN (also named The St. Peter State Hospital) is one of the most sought after "investigations" in Southern Minnesota.
The reasons are many seeing as it is a current insane asylum to some of Minnesota's most disturbed citizens. After all, it has been in use since 1866! It has historical ties to haunted stories of Minnesota such as Anne Marie Twente (her father was put in here after admitting to her murder) and the St. Mary's College murder in Winona that left ghosts in Heffron Hall.
So what exactly has been reported at the campus of this hospital?
Staff members have heard voices calling out to them and screaming in the underground tunnels that connect the buildings on this campus. Many inmates throughout the years have escaped via these underground passages onto nearby Hwy 169 and also into farmer's fields behind the hospital. Many rumors also fly about that the inmates who found their way into these tunnels created a labyrinth that caused them to go further insane and die from starvation.
Other staff members who talked to the MNPSG reported seeing shadows in the actively used hallways, the feeling of uneasiness and being watched, and also strange noises in the dark.
Currently, no one has investigated the campus because of security issues to the would-be investigation team. One thing is for sure though, almost all staff members that we talked to had no question or inability to say that this location has unseen patients that still reside there.