Guoliang Tunnel was dug through the side of a mountain by hand
Guoliang Tunnel was dug through the side of a mountain by hand By dangerousroads Located in the northwest of Henan province, in China, Guoliang Tunnel is famous for its dangerous location and difficult construction. Built in the early 1970s, it has been dubbed as the road that does not tolerate any mistakes. It’s one of […]
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