Kōyasan-ji is a significant temple located in Kōyasan, Japan, which serves as the center of the Shingon school of Buddhism. Founded in the 9th century by the monk Kūkai, also known as Kōbō Daishi, the temple is part of a larger complex that includes numerous other temples and shrines. It is renowned for its beautiful architecture and serene mountain setting. The temple is a UNESCO World Heritage Site and attracts many visitors for its spiritual significance and natural beauty. Kōyasan-ji is also famous for its cemetery, Okunoin, where Kūkai is believed to be in eternal meditation. Pilgrims and tourists alike come to experience its tranquil atmosphere and rich history.