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Secret Cities
A look at the secrets held by some of the most impressive buildings, known as the world's best mega-structures, in London, Rome, and Paris.
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Season 1 Episode Guide See All
Episode 1
London
Mon, Apr 8, 2019
Under the city of London, the underground has continued to develop alongside the city, becoming the world's longest sewer system in the 19th century and eventually home to an organized resistance against Nazis during World War II.
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