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Castle in Yamaguchi(city)

1.Ōuchi-shi Yakata
Ōuchi-shi Yakata (大内氏館, Ōuchi-shi Yakata) was the fortified residence of the Ōuchi clan in Yamaguchi, Japan. Ōuchi-shi Yakata has been designated as a National Historic Sites along with Ryōun-ji temple.[1][2][3] It was a base of the Ōuchi clan who were feudal lords and thrived during the Muromachi period to Sengoku period.[2] Its ruins have been protected as a nationally designated historic site.
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2.Kōnomine Castle
Kōnomine Castle (高嶺城, Kōnomine-jō) is a castle structure in Yamaguchi, Japan. It is located on a 338 meter mountain.[1][2]
Wikipedia  detail