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London’s secret wartime tunnels are set to draw tourists with a spy museum and underground bar
A long-secret network of tunnels 100 feet below the streets of London could be the city’s next big tourist destination.
Dubious videos of 'Underground Chicago' have gone viral. Here's the real story
Forty feet underground, the city's once-bustling system of freight tunnels remains. Social media videos show adventurers and thrill-seekers looking for the tunnels — but are they real?