Over 1,500 people are known to have been buried in this now-abandoned Washington State city. Northern State Mental Hospital: Eerie Ghost Town in Washington State. Located near Sedro-Woolley, Washington lies an eerie reminder of Washington State’s forgotten mental health history, the Northern State Mental Hospital. Once filled with over 2,700 patients, this facility grew into a self-sustaining city during its peak in the mid-20th century. It was originally established in 1909 due to overcrowding at Western State Hospital. Northern State became a crucial institution for mental health care in Washington State. Now it is one of the freakiest deserted locations in all of Washington with over 1,500 people known to be buried there.