Cedar Ave. of Nikko Road is the longest tree avenue in the world. It is about 36km long. Cedar tees were planted by Matsudaira Masatsuna. After his lord Ieyasu's death, he spent about 20 years to plan those trees. Some of them had been lost, but there are still over 12,500 trees for over 400 years. They are registered both special historical site and special natural monument.
Note: Please Cedar trees are very delicate. So, please don't step on their roots.