Alcatraz only operated for 20 years, but one of the world’s most visited prisons was used much longer. The Tower of London, home of Britain’s Crown Jewels, was once a notorious prison. Built in the 11th century, it was a prison up to the mid-20th century. This puts it among a handful of the world’s oldest prisons. This building has seen many notorious inmates, including Henry VI, Anne Boleyn, Rudolph Hess, and several Scottish kings. A tour of the Tower includes a visit to the cells with an audio tour and interactive displays of prison life. Visitors can also see Tower Green, where executions took place.
