Wall hanging road on the cliff, Artificially dug cliff tunnel, Amazing miracle

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This is a cliff tunnel in Chongqing, China. It was built in the 1970s, Also known as Guoliang Cave, Guoliang Tunnel, Guoliang Village Cliff Tunnel, It is handcut by 13 local villagers. It is the only passage leading to Guoliang Village. Known as the ninth wonder of the world