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Reruntuhan Istana Iida
Istana Iida merupakan situs istana milik Michiyasu Yamauchi generasi ketiga, terletak di tepi timur Sungai Otagawa. Istana ini terdiri dari honmaru, ninomaru, hokkaku, horikiri, disebut Istana Honjo oleh penduduk setempat.
Daerah Kuil Soshinji yang berada di sebelah utara istana ini, merupakan istana tua. Istana Iida dimiliki oleh 3 generasi klan Yamauchi yaitu Michimi, Hisamichi, dan Michiyasu Yamauchi.