We set out on an underground exploration, venturing into hidden tunnels beneath the city - but we weren’t prepared for what we would find. As we pushed through the dark, abandoned passageways ...

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Concealed for decades, a huge network of chambers beneath Rome’s Capitoline Hill is to be opened up to the public, revealing a forgotten chapter in the city’s ancient history.

A long-secret network of tunnels 100 feet below the streets of London could be the city’s next big tourist destination. Local authorities have approved plans to fill the site — originally dug ...

The tunnels lie directly below London Underground's Central Line in the city's Holborn area. Work to dig them began in secret in 1940, when Britain feared invasion by Nazi Germany.