Minnesota State Reformatory, St. Cloud (USA)
Still there, still open, though now under a different name: Minnesota Correctional Facility – St. Cloud. This is an unused Curteich-Chicago card 5B-H254, whose caption alone is worth the cost of the card: “…a grey granite wall which is the largest prison wall in the world and is only surpassed by the Great Wall of China…” and there’s more than that. Grade: 1