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Intimacy in prison.

Life inside prisons throughout Scotland and Belgium.

Inmates' unwritten rules known as the Convict Code.

Behind the walls of six maximum-security prison in Serbia, Poland, and the Czech Republic.

Inmate violence including riots, shanks and attacks on officers.

Grantt Culliver controls the disruptive inmates of Holman Correctional Facility.

Inside the maximum security facility in Eastern Iowa.

An inmate behaves erratically; an accused murderer faces the death penalty while his girlfriend is being held in the women's wing; a new female inmate raises havoc; a raid catches an inmate by surprise.

A look at life in jail, which generally houses inmates who are waiting for their trials or serving relatively short sentences.

Violence at the Limon Correctional Facility in Colorado.

On a regular basis camera crew explore where even the most heinous violations are an every day activity.

Dangerous inmates are segregated from the rest of the prison population.

Relationships both inside and outside the prison walls.

The prison's annual poetry slam.

The daily grind of prison life has been known to push some inmates to the brink.

Inmates at San Quentin State Prison find ways to fight boredom.

Cases involving a suicide, a stabbing and a man found in a Beverly Hills fountain are investigated by the Los Angeles coroner in the Season 8 premiere.

Correctional officers search prisoners for weapons.

See how the once-infamous Rikers Island jail has reinvented itself.

Inside the maximum security prison inmates call 'the end of the world.'

A profile of San Quentin State Prison in California; one of the most famous, most notorious penitentiaries in the world.

Behind the walls of Kentucky's only maximum security prison.

California's Kern Valley State Prison opens its doors in 2005.

Revealing of how these women deal with relationships and struggles.

A female housing unit inmates call a party house will turn a new inmates life upside down.

One of the most violent and volatile penitentiaries in the nation.

Meet Danny Pritchett, who has a history of being a predatory inmate, both inside and outside of prison. He was transferred to Santa Rosa after proving to be too much to handle at other Florida state prisons.

A dangerous combination of gangs, drugs and boredom encourages inmates to commit violent offenses in prison.

Miami's prison system.

Some prisoners resort to violence while others become victims.

Many inmates use their time in jail to get clean off drugs and get their lives on the right path. Others, however, simply can’t wait return to the dangerous lifestyle of the streets.

A 20-year-old inmate speaks about how he grew up on the streets and what motivates him to turn his life around.

The most extreme Lockup stories ever. These are the prison stories best described by one word. And the word is... HARDCORE.

Riverbend Maximum Security Prison inmates tell their stories.

Nine of the most violent criminals from the 'Lockup' series give chilling accounts of their crimes.