Perhaps not much to look at, the Ao no Domon tunnel has an incredible story behind it. It was carved, single-handed, through a mountain by a monk trying to repent for his sins. The book, The Ronin, is based on the story of the man who made it.
Long-time resident in Japan (since 1993) but originally from Canada. Has written guidebook chapters, magazine articles, tons of blog entries and even a book about less-known aspects of Japan. In his free time, he loves photography, cycling, and exploring interesting and obscure places around the Kansai area.