A temple of the Koyasan Shingon sect, traditionally said to have been founded by Prince Shotoku in the early 7th century. It is widely renowned for its interactive "Jigoku-do" (Hell Hall), which provides a vivid, visual depiction of Buddhist purgatory and judgment to teach the consequences of bad actions. The temple grounds also feature a small museum dedicated to retro snacks and toys from the Showa era.