Simon Thurley investigates 19th-century Millbank Penitentiary, which was built where Tate Britain now stands. In its day. It was the largest prison in the country and was designed to test out a radical new approach to incarceration. It was a plan that would ultimately end in disaster and the mistakes made there have influenced the penal system for generations
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Ready to Watch Lost Buildings of Britain, Season 1, Episode 6?