Connolly serves time in Poland's Piotrkow prison, a maximun security lockup where the country's most hardened criminals stay in cells 23 hours a day.

Mexico's el Hongo prison is home to murderers, hitmen, drug bossess and -- for one week -- Paul Connolly, who experiences life among the inmates.

Connolly spends time in two different prisons in the Philippines, where overcrowding, gangs and severe intimidation are a way of life.