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VOICE OVER: Rebecca Brayton From notorious drug lords to infamous serial killers, these dangerous criminals are locked away in the most secure facilities on Earth. Join us as we explore the stories of murderers, terrorists, and organized crime figures who are spending their days behind the strongest bars ever built. Our list includes El Chapo, the BTK Killer, the Son of Sam, and other infamous inmates in facilities like ADX Florence and Guantanamo Bay. These are the stories of society's most dangerous offenders and the fortresses that hold them. read more...