China: Guoliang Tunnel Road
China is full of unbelievable sights, both natural and human-made. And some of those places are truly breathtaking. Consider the famous Tunnel Road in Henan Province that goes through the caves of the mountain and can make your heart beat a million times a second.
Shutterstock
This terror of a road was built within a steep mountain ridge with barely any space between the wall and the cliff. Amazingly, the road was built by only 13 people and has been utilized for only about 40 years!