Athens Lunatic Asylum (OH). On December 1, 1978, a patient named Margaret Schilling disappeared from one of the active wards. On January 12, 1979, they found her body in the abandoned top floor of ward N. 20. The official cause of death was heart failure. Her body left a stain on the floor... After her death they tried cleaning the body stain, but the stain would just reappear and is still visible to this day.
