Horror Movie involving old mental ward/hospital

I am looking for a horror movie. It involves a group of people in some sort of mental ward and some on them slowly start to realize they have been there before. Someone knew where something was in the kitchen, someone knew about a room with a butterfly painted on the wall (someone later died in this room) One of the guys tried climbing out of the window to escape.
I remember bits and pieces but I have spent years trying to find this movie and can not find it.