The United States Penitentiary Administrative Maximum Facility, known as “Supermax” or ADX, is the highest security prison in the country. A $60 million facility built in 1994 on the foothills of the Colorado Rockies, the prison is home to some of the most notorious convicts in the United States. Here’s a look at some of them:

Zacarias Moussaoui, 46, of France; sentenced to life in prison in 2006 after being convicted of plotting in the Sept. 11, 2001, terrorist attacks.

Ramzi Yousef, 47, of Pakistan, sentenced to life in prison in 1996 for his role in masterminding the 1993 World Trade Center bombing, which killed six people and injured more than 1,000.

Umar Farouk Abdulmutallab, 28, of Nigeria; tried to blow up an U.S.-bound airplane on Christmas Day 2009 by trying to detonate explosives sewn into his underwear; sentenced to four life prison terms in 2012.

Terry Nichols, 60, of the United States; helped in the bombing of the Alfred P. Murrah Federal Building in Oklahoma City in 1995, which killed 168 people; sentenced in 1997 to life in prison.

Theodore Kaczynski, 72, of the United States; over a 17-year period, sent homemade mail bombs that killed three people and injured 23; pleaded guilty in 1998 and sentenced to eight life prison terms.

Robert Hanssen, 71, of the United States; pleaded guilty in 2001 to passing classified intelligence to Soviet and Russian agents over a 22-year period while working as an FBI agent; sentenced to 15 life prison terms.

Source: VOA News