Yato Castle
Yato Castle (谷戸城, Yato-jō) was a Heian period yamashiro-style Japanese castle located in the Ōizumi neighborhood of the city of Hokuto, Yamanashi prefecture, Japan. It was the primary fortress of the warlord Henmi Kiyomitsu, ancestor of the Takeda clan. The ruins have been protected as a National Historic Site since 1993.