A former prison in Philadelphia that operated from 1829 to 1971 and pioneered the solitary-confinement-based "Pennsylvania System" of incarceration, now a museum widely promoted as one of the most haunted sites in the United States.
Start in Philadelphia at the prison that pioneered solitary confinement in America, abandoned in 1971 and left to crumble for decades before reopening as a museum. Guards and visitors alike have long reported voices and movement in the empty cell blocks.
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