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This was the outer wall of Halden Fengsel, which is often called the world’s most humane maximum-security prison. I walked up the quiet driveway to the entrance and presented myself to a camera at the main door. There were no coils of razor wire in sight, no lethal electric fences, no towers manned by snipers — nothing violent, threatening or dangerous. And yet no prisoner has ever tried to escape. I rang the intercom, the lock disengaged with a click and I stepped inside.
