Powell County Museum & Arts Foundation is a local, non-profit membership organization in Deer Lodge, Montana which operates the Old Montana Prison as a museum. PCMAF also oversees and operates the Montana Auto Museum, the Frontier Museum, Yesterdayās Playthings, Cottonwood City, the Powell County Museum, the PEN Art Gallery and the Prison Cow Ice Cream Shop as part of the Old Prison Museum ComplexPowell County Museum & Arts Foundation is a local, non-profit membership organization in Deer Lodge, Montana which operates the Old Montana Prison as a museum. PCMAF also oversees and operates the Montana Auto Museum, the Frontier Museum, Yesterdayās Playthings, Cottonwood City, the Powell County Museum, the PEN Art Gallery and the Prison Cow Ice Cream Shop as part of the Old Prison Museum Complex