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Entrance of the Underground City at Xidamochang Jie. The Underground City (Chinese: 地下城; pinyin: Dìxià Chéng; Wade–Giles: Ti 4-hsia 4 Chʻêng 2) is a Cold War era bomb shelter consisting of a network of tunnels located beneath Beijing, China. It has also been referred to as the Underground Great Wall since it was built for the ...
Underground Project 131 (Chinese: "131"地下工程; pinyin: "131" Dìxià gōngchéng) is a system of tunnels in Hubei province constructed in the late 1960s and the early 1970s to accommodate the Chinese People's Liberation Army command headquarters in case of a nuclear war. The facility was never fully completed or used, and is currently ...
The caves are notable in several respects: The caves are very large for human-made excavations: The average floor area of each cave is over 1,000 m 2 (11,000 sq ft), with ceiling heights of up to 30 m (98 ft), and the total area covered [further explanation needed] in excess of 30,000 m 2 (320,000 sq ft).
Photos show the inside of the well-preserved hidden tunnels.
The Old Portland Underground, better known locally as the Shanghai tunnels, is a group of passages in Portland, Oregon, United States, mainly underneath the Old Town Chinatown neighborhood and connecting to the main business section.
The city of Sacramento is yet another community lifted above floodwaters during the latter half of the 19th century, leaving behind underground spaces. Adults can tour the historical remnants with ...