An underground network of tunnels was discovered under Liverpool. Now workers think they’ve solved the mystery

By Maureen O’Hare, CNN Liverpool, England (CNN) — It’s an unassuming entrance to what’s been described as the world’s largest underground folly, a centuries-old mystery buried at least 60 feet below the streets of Liverpool, England, and stretching out for perhaps a square mile or more. The peeling, graffiti-covered facade of a Georgian house is all that remains at ground level, the front wall…

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