Sagami River Bridge ruins

The Former Sagami River Bridge is the ruins of a Kamakura period bridge over the former course of the Sagami River, located in what is now the city of Chigasaki, Kanagawa Prefecture in the southern Kantō region of Japan. The site was designated a National Historic Site of Japan in 1926, with the area under protection expanded in 2007.It was further designated as a Natural Monument in 2013.

Source: Wikipedia