Alcatraz! For a lot of us, this former island prison occupies an iconic space in the American zeitgeist. It's been home to some of the country's most notorious criminals, and has been the inspiration for tons of top-notch works of fiction and cinema. Yet in today's episode, Ben, Noel and Max learn this supposedly-impenetrable place was not once, but multiple times invaded and occupied by Native American activists in the modern day.