Houchengzui Stone City: This ancient Chinese megacity hides mysterious underground tunnels that have been buried for more than 4,000 years | World News
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May 7, 2026
A huge ancient stone city in northern China that has been buried for thousands of years has become even more mysterious. Archaeologists working in Shicheng, Houchengzui, Inner Mongolia, have discovered a hidden network of underground tunnels dating back…