Kawagoe Castle is a flatland Japanese castle in the city of Kawagoe, in Japan's Saitama Prefecture. It is the closest castle to Tokyo to be accessible to visitors, as Edo castle is now the Imperial palace, and largely inaccessible.
Along with a number of other castles in the region, Kawagoe saw much action in the 15th-16th centuries, as the Later Hōjō clan and two branches of the Uesugi clan vied for control of the Kantō region. In the 1450s, Kawagoe was held by the Yamanouchi branch of the Uesugi; the Ogigayatsu branch controlled nearby Shirai castle in Shimōsa Province, and the newly built Edo castle, which significantly bolstered their tactical advantages over their Yamanouchi cousins.
Wikipedia https://en.wikipedia.org/wiki/Kawagoe_Castle
Address Kawagoe, Japan
Coordinates 35°55'27.688" N 139°29'29.181" E