Kongobuji is a historic Buddhist temple in Koyasan. It serves as the headquarters of Shingon Buddhism and features a beautiful rock garden and many important artifacts.

Oku-no-In is a deeply spiritual site in Japan where many people come to pay their respects. It features the Gobyō crypt, where the founder of Shingon Buddhism, Kōbō Daishi, is believed to meditate eternally, surrounded by 200,000 tombs.

Chumon Middle Gate is a significant entrance to the Garan complex in Koyasan. It features guardian king statues and was renovated in 2015 to commemorate Kōya-san's 1200th anniversary.

Koyasan Okunoin is the largest cemetery in Japan. It features over 200,000 tombstones, including that of the founder of Shingon Buddhism, Kōbō Daishi, and is surrounded by ancient cedar trees.

Mount Koya is a sacred site for the Shingon sect of Buddhism. It features over 1000 years of teaching and meditation sites, surrounded by misty mountains and wooden temples.