Kawazu-Nanadaru Loop Bridge, in Japan, is an example of how to build a bridge from one mountainside to another when the sides of the mountain are so steep that it is not possible to build a road at the same elevation on both sides. It's one of the most spectacular bridges in the world. 

The Old Inunaki Tunnel in Japan is a famous place where people have been killed or burnt to death and many murders took place here.

Iroha-zaka is a pair of famous winding roads located in the mountains of Tochigi Prefecture, Japan. It’s the main access to connect the lower elevations around central Nikko to the higher elevations of the mountainous Okunikko region. Each corner has a letter of ancient Japanese alphabet, and you will see it in alphabetical order. 

Located in Nagano Prefecture, in the central Chūbu region of Japan, the Norikura Skyline is a great road where travelers can climb up to 2.700m (8,858ft) above the sea level without stopping. It’s the highest public road in Japan.