Is there any underground city in the world?

Dixia Cheng, Beijing Underground City, China The Beijing Underground City, also known as Dixia Cheng, is an impressive engineering feat that lies beneath the bustling streets of Beijing, China. This vast network of tunnels and chambers spans over 33 square miles at a depth range of approximately 8-18 meters.



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Derinkuyu (also known as Elengubu, Cappadocian Greek: ?a?a??p? Malakopi; Turkish: Derinkuyu Yeralti Sehri) is an ancient multi-level underground city near the modern town of Derinkuyu in Nevsehir Province, Turkey, extending to a depth of approximately 85 metres (280 ft).

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It is legal for consumers to book hidden city tickets and ditch the second half of the trip. But it violates most airlines' policies.

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London Underground is longer at 250 miles long to Paris Métro's titchy 133 miles. But the Métro has more lines (16 versus 11) and more stations (303) than London (270).

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