Kingston Penitentiary operated continuously for 178 years—longer than any other maximum-security institution in Canada—and during that span, more than 1,400 inmates died within its limestone walls. Opened in 1835 on the shore of Lake Ontario, the fortress-style prison held Canada's most dangerous criminals, from bank robbers and counterfeiters in the 1840s to organized crime figures and notorious killers in the 20th century. Executions by hanging took place in the prison yard until 1960. Riots, stabbings, and suicides marked its history, and staff who worked overnight shifts reported footsteps in empty corridors, cell doors slamming without cause, and cold drafts that appeared in sealed blocks. When the penitentiary closed in 2013, the Canadian government declared it a National Historic Site. The decision preserved not only the architecture—radial cell blocks designed on the Auburn system, guard towers, solitary confinement ranges—but also the stories of the men who lived and died inside. Within two years, kingston penitentiary ghost tours became one of Ontario's most sought-after historical experiences. Guides lead visitors through dimly lit cell blocks, the prison hospital where inmates died of tuberculosis and untreated injuries, and the tunnel system that connects the buildings beneath the yard. Every tour stops at the execution area and the segregation wing, where the most violent offenders spent years in isolation. The site's Gothic Revival stonework and iron-barred galleries create an atmosphere unlike any other heritage building in Canada. Original cell furnishings remain in place—metal beds bolted to walls, rusted sinks, graffiti carved into limestone by prisoners awaiting trial. The North Gate, built in 1845, still bears the scars of the 1971 riot, when inmates set fires and held guards hostage for four days. Kingston's location on the St. Lawrence corridor made it the logical choice for a federal prison in the 19th century, but the building's isolation from the downtown core also contributed to its reputation as a place where men disappeared from public memory. Paranormal investigators have recorded unexplained audio phenomena in the hospital wing and temperature drops in the segregation cells. Today, the haunted prison experiences operate year-round, with evening walks scheduled from March through November and special after-dark events on weekends. Fort Henry, the limestone fortress overlooking the penitentiary, offers its own ghost tour that covers military history and soldiers' deaths during the War of 1812. Trolley tours through downtown Kingston include stops at the prison's exterior and the waterfront where condemned men were once transported by barge. The combination of verified historical violence, preserved architecture, and decades of reported supernatural activity has established the kingston penitentiary ghost tours tour as a cornerstone of the city's cultural tourism.