The Underground City (Chinese: 地下城; pinyin: Dìxià Chéng), also known as Dixia Cheng, is a bomb shelter comprising a network 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. (Wikipedia)
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music: Felix L’Amour
China-underground is website about China and Chinese culture.