Yamaga Onsen Sakura-yu
One of Kyūshū's largest wooden bathhouses, in the centre of the old castle town of Yamaga in northern Kumamoto. Built in the Edo period as a rest house for the Hosokawa lords, its Meiji-era rebuild is attributed to Sakamoto Matahachirō, the master carpenter of Dōgo Onsen Honkan. Faithfully reconstructed in 2012, the curved-gable entrance, dragon transoms and high-ceilinged bath hall feel far grander than the ¥350 admission. The water is a clear, silky alkaline simple spring, with a drinking fountain. Open long hours, 6:00–24:00 (last entry 23:30), closed the 3rd Wednesday. Soap and towels from the vending machine. Combine with the Yachiyoza theatre (Important Cultural Property), the Buzen Kaidō streetscape and the August lantern festival.