City of Naours

30th October 2019 45 mins Season 1 Episode 6

An underground city beneath a forest in Northern France built to house 3,000 people, an ice cave under Iceland's biggest glacier, and a subterranean power station in London.

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Season 1 · Episode 7

Jersey War Tunnels

The underground bases built by the German army during the occupation of Jersey, and a group of more than 20 underground cities in Turkey, one of which dates back to 800BC.

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