Nikkō National Park is famous for its UNESCO World Heritage Site which was registered as the 10th World Heritage Site in 1999. This encompasses Rinnō-ji, Nikkō Tōshō-gū, Mount Nantai, and Futarasan Shrine. The Kegon Falls, also in Nikkō, is popular with tourists. To travel between the city and the falls, automobiles and buses take the Irohazaka, a road with dozens of switchbacks. In addition, 400-year-old Japanese Cedars (about 13,000 in total) line the famous Cedar Avenue of Nikkō for roughly 35 km, making it the longest tree-lined avenue in the world.