Mount Koya (Koyasan in Japanese) is the center of one of the most important Buddhist sect in Japan, the Shingon Buddhism. On the mountaintop, you will find a small hidden town made of temples with among them the head temple of Shingon Buddhism: Kongobuji. Enjoy the unique experience of staying at a temple lodging (shukubo) for the night and try to live as an authentic monk, eating vegetarian monk's cuisine and attending the daily prayers.