Terror Behind the Walls (TBTW) returns to Easter State Penitentiary in Philadelphia with a new attraction — Machine Shop. TBTW will continue its feature from last year, where visitors can opt into an interactive experience and allow themselves to be touched, led and taken by prisoners. The proceeds from the haunted prison benefit preserving the penitentiary and its full-time museum. TBTW will run from Sept. 19 through Nov.8, 2014. 

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