🇨🇳 Guoliang Tunnel, China
One of the most dangerous mountain roads in the world is the Guoliang Road located in the Chinese province of Henan. The length of the route is 1.2 km (height 5 meters and width 4 meters) and at its core it is a tunnel cut through sheer cliffs. Guoliang Tunnel was opened in Taihangshan Rock in May 1977. Its construction took more than five years.
https://goo.gl/maps/PtB2nUQNbYv9nUpm7