The building, by the Missouri River, is now a landmark in downtown Jefferson City with a series of tours shedding light on its dark past – and, according to some, ghostly goings-on. Visitors can see the yards, tiny cells, housing units and, most chillingly, the gas chamber. There’s also an old cell block dating back to the Civil War, buried and forgotten for more than a century until being unearthed during some construction work in 1985.

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