Medieval Maze of Secrets

21st February 2022 45 mins Season 2 Episode 7

Exploring long narrow tunnels beneath Exeter that were built in medieval times to protect the city. Plus, a marble quarry under the pine forests of Vermont.

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Season 2 · Episode 8

Buried Lab of the Black Hills

Exploring a former gold mine turned scientific laboratory in South Dakota. Plus, limestone tunnels in London and a former water cistern in Denmark.

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