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The Old Idaho Penitentiary’s annual Halloween bash is back! Enjoy an evening of Halloween exploration at the historic Idaho State Penitentiary, with music and live entertainment, food trucks, alcohol available for purchase, ghost stories presentations, and bumps in the night throughout the site, along with the RETURN of the Old Idaho Penitentiary’s haunted cell block, Terror on Cell Block 4 (Idaho’s only haunted cell house), and the Thrill the World dance group. Premiering this year: a second haunted house – the haunted infirmary! Admission is $20 per person. Ages 18+ only (ID required at the door).