Millions of prisoners across the globe are incarcerated in some of the highest security penitentiaries – which are run with military precision.Many of the maximum-security prisons are held in the highest regard, with few ever having a breach made by an inmate – but it hasn't stopped some from trying.Some of the toughest centers in the world have held the most notorious criminals, including Joaquín '' Guzmán, the leader of 's Sinaloa drug cartel, and Unabomber Theodore 'Ted' Kaczynski, 79.
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