In the Rocky Mountains of Colorado lies the ADX Correctional Facility - America's most secure prison • Among the occupants: El Chapo, al-Qaeda terrorists and serial killers • "The prisoners see the sky for the last time - and then it strikes them"

The scenery in Florence is hilly and snowy, almost pastoral - but Dejoker Tsarnaev, the terrorist responsible for the 2013 Boston Marathon, will not enjoy this view. Tsarnaev was transferred to the Supermax Division of the ADX Prison, Colorado.

Tsarnaev is not alone in the tough prison, with which are some of the most vicious and famous terrorists in the United States - including members of al-Qaeda, Ted Kazinsky known as the "Yonbomber," spies and figures from the world of organized crime like El Joaquin Guzman - El Chapo.

23 hours a day in isolation, surrounded by concrete

The lives of 400 ADX prisoners are hard to imagine. They are in complete isolation 23 hours a day, where they are in a concrete compartment, where the furniture is also part of the structure itself - a concrete bed, a concrete table and a concrete chair. The window is also designed in a way that will not allow prisoners to see beyond the building, and the prisoners cannot see each other while in their cells.

"The architecture of the building is a means of control," explained Robert Hood, director of the jail in an interview with CNN. "We designed the building so that the prisoners could not see the sky. When they reach the prison gates it strikes them, you can see it in their faces. They see the Rocky Mountains in the background and realize that this is the last time they will see them. It's a bit like life after death and after a certain period, It's worse than death in my opinion. "

Like death, this is probably the only point that Hood and human rights organizations would agree on in prison terms. Amnesty International criticized the facility's conditions and called them inhumane. Six prisoners have committed suicide in their cells since the facility opened in 1994.

"I want to live, I always survived, but many times I wanted to die," said Thomas Silverstein, who was convicted of armed robbery in 1971, and after the murder of two prisoners and a prisoner was placed in complete isolation terms - some in ADX in a class action lawsuit filed by Amnesty. "I know I don't want to die. I want to live in jail but in some way." Silverstein died in isolation before a device.

"For many people, being sent to ADX is a life sentence," said Lua Robner, a law professor at the University of Denver who represented prison inmates - while claiming conditions at the Guantanamo facility are sometimes superior to the Colorado mountains. "This prison takes everything from you. Your life is limited to four walls."

"Tsarnaev is going to live for a long time, maybe even 50 years in isolation. You can't imagine that," Rubner added to the US media network.