Futarasan jinja

 is a Shinto shrine in the city of Nikkō, Tochigi Prefecture, Japan. It is also known as Nikkō Futarasan Shrine, to distinguish it from the shrine in nearby Utsunomiya. Futarasan enshrines three deities: Ōkuninushi, Tagorihime, and Ajisukitakahikone. It is located between Nikkō Tōshō-gū and the Taiyū-in Mausoleum. Many visitors go to all three, as well as to Rinnō-ji.
Together with Nikkō Tōshō-gū and Rinnō-ji, it forms the Shrines and Temples of Nikkō UNESCO World Heritage Site. 
The shrine possesses two swords that are National treasures of Japan. Additionally, dozens of buildings and cultural artifacts are listed as Important Cultural Assets.
The crossing the Daiya River belongs to the Futarasan Shrine. This beautiful vermilion lacquered structure is known as one of the three most beautiful bridges in Japan and is a perfect gateway for Nikko. The bridge was registered as a World Heritage in December 1999. Shinkyo measures 28 meters long, 7.4 meters wide, and stands 10.6 meters above the Daiya River.
According to legend, a priest named Shōdō and his followers climbed Mt. Nantai in the year 766 to pray for national prosperity. However, they could not cross the fast flowing Daiya River. Shōdō prayed and a 10 foot tall god named Jinja-Daiou appeared with two snakes twisted around his right arm. Jinja-Daiou released the blue and red snakes and they transformed themselves into a rainbow-like bridge covered with sedge, which Shōdō and his followers could use to cross the river. That is why this bridge is sometimes called Yamasugeno-jabashi, which means the "Snake Bridge of Sedge".
The Shinkyo has been rebuilt many times but has followed the same design pattern since 1636, when it could be used only by messengers of the Imperial court. It has been opened to the general public since 1973.
History.
The shrine was founded in 767 by Shōdō "shōnin" (勝道上人). The shrine takes its name from Mount Nantai, which is also called .
Yayoi period.
Archeologists affirm that during the Yayoi period the most common (a "yorishiro" housing the enshrined "kami") in the earliest Shinto shrines was a nearby mountain peak supplying with its streams water, and therefore life, to the plains below, where people lived.
Mount Nantai constitutes Futarasan Shrine's "go-shintai", and the shrine is an important example of this ancient type of mountain cult. Significantly, the name itself means "man's body". The mountain not only provides water to the rice paddies below, but has the shape of the phallic stone rods found in pre-agricultural Jōmon sites.
Heian period.
Futarasan was designated as the chief Shinto shrine ("ichinomiya") for the former Shimotsuke province.
Meiji-Showa periods.
From 1871 through 1946, Futarasan was officially designated one of the , meaning that it stood in the mid-range of ranked, nationally significant shrines.