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Wikipedia: The Underground City, also known as Dixia Cheng, is a bomb shelter comprising a of tunnels located beneath Beijing, China, which has since been transformed into a tourist attraction. It has been called the Underground Great Wall because it was built for the purpose of military defense. The complex was constructed during the 1970s in anticipation of a nuclear war with the Soviet Union, and was officially reopened in 2000.
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![Entrance of the Underground City at Xidamochang Jie [Entrance of the Underground City at Xidamochang Jie]](http://images.ookaboo.com/photo/s/Dixia_Cheng_entrance_s.jpg)
![Notice by the side of the Underground City entrance at Xidamochang Jie explaining that the complex is closed for... [Notice by the side of the Underground City entrance at Xidamochang Jie explaining that the complex is closed for...]](http://images.ookaboo.com/photo/s/Dixia_Cheng_notice_s.jpg)