There are a number of amazing stones on which some strange decorative designs are carved around Hibayama Mountain; that is known as a mythical mountain which is introduced in the Japanese oldest chronicle "Kojiki" as the summit where Izanaminomikoto, who is the mythical goddess giving a birth of Japan, was buried. These amazing stones are lying on the corner of Taishaku National Park, called Joko seki (stone) on which some geometric decorative design are carved in the width of 5-10m, depth of 2-5m. The Joko-seki which is lying around the summit of Toriboshi-mountain, in the northern Hiba-mountain range is pointing to the Hibayama tomb(tomb of Izanamino-mikoto(name of Japanese mythical goddess). It is said to be related to ancient religion.