Go behind bars and experience the harsh realities of the world's toughest prisons. From gang bosses to hardened killers, even the most dangerous criminals learn the meaning of fear within these walls. Take a journey across four continents and six different prisons, where the rules are strict, the conditions are harsh, and the inmates are faced with the toughest challenges of their lives. Witness the unknown world beyond the gates, walls, and barred windows, where the toughest of the tough are tested to their limits.

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Some TV shows that have similar genres and were produced around the same time as Behind Bars: The World's Toughest Prisons include Psychic Kids, True Conviction, My Dirty Little Secret, Sex Sent Me to the Slammer, Snapped: Killer Couples, Home Alone.