Japan: Kintai Bashi or Soroban Bashi, Iwakuni, Yamaguchi Prefecture. Photo by Kusakabe Kimbei (1841-1934), c. 1880-1899. The Kintai Bridge is a historical wooden arch bridge, in the city of Iwakuni, in Yamaguchi Prefecture. The bridge was built in 1673, spanning the Nishiki River in a series of five wooden arches, and the bridge is located on the foot of Mount Yokoyama, at the top of which lies Iwakuni Castle. Declared a National Treasure in 1922, Kikkou Park, which includes the bridge and castle, is one of the most popular tourist destinations in Japan.