opened in Sakata, Yamagata Prefecture, Japan, in 1947.
The residence was built in 1813 by the fourth head of the , Junji Homma, who was a noted collector of Japanese swords and chairman of the Nihon Bijutsu Token Hozon Kyokai. The Homma family was one of the great merchant houses of Sakata during the Edo Period, growing rich on the kitamaebune coastal trade and by moneylending. During the Meiji period, they were one of then largest landowners in the Tohoku region of Japan. The Seienkaku villa was built as a secondary residence and guest house. Visitors include members of the Sakai and Uesugi clans, former daimyà  of the Shà Ânai and Yonezawa Domains, as well as in 1925 the future Shà Âwa emperor. A second story was added to the wooden building in 1908 in advance of a planned visit by the future Taishà  emperor. It was opened as an art museum from 1947, and a modern annex was added in 1968.
The collection of some 2,500 objects includes a Kamakura-period edition of Ise Monogatari and three other Important Cultural Properties, works by Kanà  Tan'yà «, Nagasawa Rosetsu, Ità  Jakuchà «, Shiba Kà Âkan, Matsumura Goshun, Okada Hankà Â, Kishi Ganku, , , , , and Kuroda Seiki, as well as Goryeo celadons, raku ware by Chà Âjirà Â, lacquerware, sculptures, and Japanese traditional dolls.
The or "Dancing Crane" Gardens, is designated a National Place of Scenic Beauty. It incorporates Mount Chà Âkai by way of borrowed scenery.
The folk song 'Homma Sama is out of our reach but we wanna be Tonosama at least' shows the prosperity of the Homma family when "Tonosama" as the top of warrior class was ranked highest according to the social class system (Emperor, Court Nobility, Shà Âgun, Daimyà Â, Samurai, Peasants, Craftsmen and Merchants) established in the early Edo period (See also Edo period#Society).