Guoliang Tunnel Road (China)
The road in Taihang mountains was built by local villagers: it took five years to finish the 1,200 metre long tunnel which is about 5 meters high and 4 meters wide. Some of the villagers died in accidents during construction; undaunted, the others continued. On May 1, 1977, the tunnel was opened to traffic. It is located in the Taihang Mountains, in the Hunan Province of China.