Ogasawara clan castle sites

Ogasawara clan castle sites - Credit: Wikimedia Commons

The were a number Sengoku period yamashiro-style Japanese castles located in what is now part of the city of Matsumoto, Nagano prefecture. These fortifications were built in the Muromachi period by the Ogasawara clan, who ruled the area at the time. Two of the castle ruins, that of Igawa Castle and Hayashi Castle, have been protected collectively as a National Historic Sites since 2017. Read more on Wikipedia

type: military structure
date from: 1590

Source: en.wikipedia.org