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In this episode we explore the tunnels under the city of Exeter in the UK. These long narrow tunnels were built in medieval times to protect the city, but they still exist today, hidden from view under shopping malls and busy highways.
We visit a marble quarry that has operated beneath the quiet pine forests of Vermont for almost a century. The fine marble found here can be found in almost every US public monument.
And we travel to the tiny country of Moldova, in Eastern Europe, to explore its miles upon miles of wine tunnels, stretching deep under the rolling hills. A former limestone mine, this subterranean world hosted wine production for the Soviet Union, and the wines here are now starting to make a big impact on the world stage.
