In the new Discovery Channel documentary, Koppel travels to the border of Iran's border with Iraq, the ancientcapital of Isfahan, the holy city of Qom and the Persian Gulf.
Set in the dense forests of the Kii Mountains overlooking the Pacific Ocean, three sacred sites - Yoshino and Omine, Kumano Sanzan, Koyasan - linked by pilgrimage routes to the ancientcapital cities of Nara and Kyoto, reflect the fusion of Shinto, rooted in the ancient tradition of nature worship in Japan, and Buddhism, which was introduced from China and the Korean Peninsula.