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Schwalmstadt, a 12th-century fortress surrounded by a moat, houses some of Germany's worst offenders, many of whom attend intense therapy sessions.
Raphael Rowe spends a week behind bars at Tacumbu prison in Paraguay, where inmates scrounge in the trash in order to pay their own way.
The tropical island of Mauritius is home to Melrose maximum security prison, where even the smallest infraction is met with extreme punishment.