In Wuxi County, Chongqing, China.
There is a canyon more than 100 kilometers long.
The canyon is more than 2,400 meters deep.
It is known as the deepest canyon in Chongqing, the Lanying Grand Canyon.
And high up in the canyon.
Zhoujiaping Qingkouling's Tiger's Mouth.
A highway hanging over a thousand meter cliff.
Less than 3 meters wide.
About 1,500 meters long.
It took 23 local villagers 4 years and 3 months to cut it out.
On the day the highway was built and opened to traffic.
All the villagers cried.
It wasn't that they were tired.