Reisenji Onsen Kyodo Yokujo

Insider tip — Reisenji Onsen Kyodo Yokujo is a historic cooperative bathhouse (kyodo yokujo) in the Suwa basin of Nagano, one of Japan's oldest community bathing institutions operated collectively by neighborhood residents. The iron-rich waters impart a distinctive amber-brown color and metallic mineral tang characteristic of the Suwa volcanic geothermal field. The original Meiji-era tiled interior survives largely intact, offering a rare glimpse of Japanese public bathing culture from a century past. Arrive precisely at opening time to share the first clean draw of morning mineral water with local regulars.