Manteno State Hospital stands as one of the most storied and consequently haunted psychiatric institutions in American history, its imposing structure having once dominated the landscape of central Illinois as a fortress of medical authority and institutional power. The facility opened its doors precisely two days after Christmas in 1930 with the arrival of the first one hundred male patients transferred from the overcrowded Kankakee State Hospital, marking the beginning of what would become a sprawling psychiatric empire. The facility was designed to accommodate approximately five thousand five hundred patients alongside a staff of seven hundred sixty, projecting an enormous infrastructure meant to address the rapidly growing crisis of mental illness in Depression-era America. By the 1950s, during its period of maximum expansion, Manteno would swell to accommodate more than eight thousand patients, becoming one of the largest psychiatric institutions in the entire nation, a sprawling complex of interconnected buildings and mysterious tunnels that housed far more human suffering than it could adequately treat. The hospital's medical practices became synonymous with the darkest chapter of American psychiatric history. Manteno became a center for experimental and often barbaric procedures. Government doctors employed electroshock therapy with devastating frequency, subjecting thousands of patients to electrical current meant to recalibrate their neural pathways. Worse still were the transorbital lobotomies performed in the hospital's surgical theaters, procedures that destroyed neural tissue government physicians believed needed alteration. Perhaps most horrifying was the deliberate infection of patients with malaria, a disease exposure that was defended by physicians as therapeutic intervention. The hospital became a place where the boundary between medical treatment and human experimentation dissolved entirely. The catastrophe known as the Manteno Madness in 1939 brought international attention to the hospital's conditions. A typhoid fever outbreak infected three hundred eighty-four patients and staff, resulting in forty-seven deaths. The epidemic exposed the hospital's inadequate infrastructure and the true costs of housing too many vulnerable people in a single institution. The deaths from typhoid added to a mounting body count throughout the hospital's decades of operation as patients died from untreated illnesses, suicides, accidents, and complications of the hospital's own experimental procedures. Paranormal investigators reported consistent accounts of supernatural phenomena concentrated throughout the complex. The underground tunnel system became a particular hotspot for paranormal activity, with investigators capturing electronic voice phenomenon recordings suggesting spirits of deceased patients and medical personnel remained trapped within these passages. Throughout the main buildings, witnesses reported hearing screaming and crying voices emanating from empty corridors, and disembodied voices were frequently heard speaking over the hospital's inoperative intercommunication system. Full body apparitions of doctors, nurses, and patients were sighted by paranormal investigators and visitors alike, their spectral forms suggesting countless individuals who never found peace in the afterlife. The hospital ceased operation in 1985 and was demolished in 2015, erasing from the physical landscape the building where so much suffering occurred. Yet the land itself allegedly retained the imprint of the emotional and psychological devastation that transpired within the hospital's walls. Reports persist of paranormal activity in homes constructed on the former hospital grounds, suggesting that demolition and development could not dispel the spiritual residue of Manteno's tragic history.