Inside The World's Toughest Prisons

Travelling to Moldova, Rapheal Rowe locks himself inside Penitentiary 17, a maximum-security prison housing more than 100 inmates with life sentences.

The Central Jail of Nicosia in Cyprus undergoes radical transformations over the years; a look at whether these changes are for the better.

At Zenica prison in Bosnia and Herzegovina, Raphael Rowe finds himself trapped with inmates ranging from organised crime bosses to ruthless killers.

Raphael Rowe investigates one of Greece's most overcrowded maximum-security prisons, overflowing with some of the country's most dangerous offenders.