Mt. Koya-san is located in the northeastern part of Wakayama and is in Koya-Ryujin Quasi-National Park. On the peak of Mt. Koya-san, surrounded by mountains, is Kongobu-ji Temple, founded by Kobo Taishi, the Head Temple of Esoteric Buddhism, which has a 1200-year-long history. More that 120 temples are scattered throughout the area.
A number of structures exist in the mountain. For instance, the 25-meter-high Dai-mon Gate, Important Cultural Property, that has served as the main entrance to the temple ever since its founding day, or the temple structure complex, National Treasure, and the Danjo-garan complex. Koyazan-Reiho-kan Treasure House exhibits the tremendous cultural properties of Mt. Koya-san.
Lodging facilities are provided by the temple for the followers, available also for visitors.