Imagine spending years without seeing the sky or hearing another human voice. Your world is reduced to four concrete walls, a steel door, and silence so intense it slowly begins to destroy your mind.

ADX Florence was built for inmates the U.S. prison system could not safely hold anywhere else, from cartel leaders and spies to terrorists and serial killers. Prisoners can spend 22 hours a day in ...

Eric King served almost two years at the federal super-maximum security prison ADX Florence in Colorado. ADX is often described as the US's most restrictive prison, and it houses some of the most ...