7 Most Dangerous Inmates Locked in ADX Florence | Full List & Shocking Details

Deep within the Colorado Rockies lies the most secure prison in the world: ADX Florence. Known as the "Alcatraz of the Rockies," this federal Supermax facility is the final destination for the absolute worst of the worst. It is designed for one purpose: total isolation. In this video on Undercover Mysteries, we count down the 7 most dangerous inmates locked in ADX Florence right now. From cartel kingpins like El Chapo to domestic terrorists and gang leaders, these are the criminals deemed too high-risk for any other facility on Earth. Once the steel doors shut here, there is no way out.