Glensville Sanatorium was a sanatorium in West Virginia before it was abandoned when all of the patients escaped and the staff were murdered. It appears in Wrong Turn 4: Bloody Beginnings.
It is unknown when the sanatorium was established but is possible sometime during the late 1800's. In 1974, at the Glensville Sanatorium in West Virginia, three deformed patients known as the Hillicker Brothers (Three Finger, One Eye and Saw Tooth) escaped from their cells and released the other patients; together, they very brutally massacre the orderlies and doctors. The fate of the patients are unknown but it is possible considering they were still alive thirty years later, that they may have killed and eaten them for the past thirty years but this is unknown.
After these events, the sanatorium then became abandoned and was lived in by Three Finger, One Eye and Saw Tooth, it is unknown how they survived. In 2003, a group of college students became lost near the sanatorium and decided to stay there. Over the course of the next two days, the group were all murdered. Some time after, Maynard Odets then came along and brought them to Fairlake, West Virginia to live with him. It is unknown what happened to the hospital after these events as it was never seen again.