Impressive underground cities where people actually lived
You'll be surprised at what you can do with a hole in the ground
Hidden entrances, ancient tunnels, and complex histories lurk beneath earth's surface, teeming with tales of a life that few people know much about. Many underground paths or malls claim to be cities, but check out this gallery to see the few real underground habitations where people have actually carried out their lives.
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LIFESTYLE Olympic games
TRAVEL United kingdom