Imagine a place where sunlight barely penetrates, and walls don't just separate bodies—they isolate souls. ADX Florence, known as "The Alcatraz of the Rockies," is America's most secure and mysterious prison. Home to the nation's most dangerous criminals, including terrorists, cartel leaders, and serial killers, this supermax facility is designed for total isolation. But what makes ADX Florence so forbidden? In this episode of It's History, we uncover the secrets behind its impenetrable walls. Discover the history of ADX Florence, from its inception in 1994 to its current role as a model of extreme incarceration. Learn about the notorious inmates held here, including Theodore Kaczynski, Ramzi Yousef, and Joaquín "El Chapo" Guzmán. We also explore the psychological impact of total isolation on inmates, the ethical debates surrounding its operation, and why this prison remains off-limits to the public. Join us for a deep dive into the prison America wants you to forget.