Lockup takes us inside maximum security prisons, showing us what life is really like for those that are spending several years there, their whole life, or even those waiting to be executed.
The daily grind of prison life has been known to push some inmates to the brink.
Watch Now:iTunesPrisoners take hostages in the Penitentiary of New Mexico.
Watch Now:iTunesPairing up inmates into two-man cells requires careful screening.
Watch Now:iTunesThe Wabash Correctional Facility houses more than 2,000 convicted felons.
Watch Now:iTunesLife inside prisons throughout Scotland and Belgium.
Behind the walls of six maximum-security prisons in Serbia, Poland, and the Czech Republic.
Watch Now:iTunesHow inmates spend their time in jail.
In a life full of restrictions, we've seen inmates take control of whatever they can, despite the consequences. We've seen frustrated inmates reach their breaking point. And in the battle of wills, some will take actions that can never be reversed.
Watch Now:iTunesInmates must choose between doing their time or following a more self-destructive path.
Watch Now:iTunesJoining a gang while in prison.
An inmate feels his survival depends on staying in prison; prison food.
Contraband finds its way to the inmates.
Watch Now:iTunesAt the Hillsborough County Jail in Tampa, Fla., an accused murderer in a high profile case tries to cash in on her notoriety and a convicted rapist loses his cool in court.
Watch Now:iTunesAt the Sedgwick County Jail in Wichita, Kansas, many inmates rely on their faith to help them through their time behind bars.
Inmates find various ways to smuggle in contraband.
Watch Now:iTunesA group inmates find themselves in racial conflict.
Watch Now:iTunesLife inside Alaska's Spring Creek Correctional Center.
Watch Now:iTunesAn inmate finds himself on the wrong end of an attack; another with a reputation for violence and another waits trial for murder.
Watch Now:iTunesSometimes life has other plans, like when the ex leader of a gang faces a whole new reality he discovers the price for coming clean.
Watch Now:iTunesThe Residential Treatment Unit.
Watch Now:iTunesNo matter the circumstances that brought them there, Maricopa County Jail in Phoenix, Arizona, will have a profound effect on who the inmates will become. And for some, their time in jail will reveal their true nature.
Watch Now:iTunesGrantt Culliver controls the disruptive inmates of Holman Correctional Facility.
Watch Now:iTunesCorcoran officers put their lives on the line to prevent inmate attacks.
Watch Now:iTunesMeet 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.
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