World's Toughest Prisons

An unflinching look inside the world's toughest prisons, beginning with Colony 100 in Kharkiv, Ukraine.

The South Cotabato prison in the Philippines is one of the most crowded prisons in the world, and none of the inmates were convicted. Everyone awaits the trial.

Inmates fight many battles: against other prisoners, against the guards, and against themselves. It is a battle that most lose.

Inmates fight many battles: against other prisoners, against the guards, and against themselves. It is a battle that most lose.

Crime journalist Paul Connolly is on a mission to experience life as an inmate in El Hongo prison, one of Mexico's toughest maximum security jails where no one has ever escaped.

Hailed as Armenia's first European standard prison when opened in 2014, Armavir prison has since been accused of violating inmates' human rights.