Kusatsu, Gunma

Steam rises from the湯畑 at any hour — the sulfurous plumes catch light differently in morning than at dusk, and the wooden channels that guide the flow have been carrying湯の花 to the surface for generations. This is Kusatsu, sitting on a high plateau ringed by the peaks of the 三国山脈 to the northwest and the volcanic shoulder of 白根山 above. The elevation keeps the air thin and the winters deep with snow; the town is designated a heavy-snowfall zone, yet it has been inhabited and busy since the Edo period, when people came here not for leisure but for serious湯治 — long soaking cures, regulated by time, in water so acidic it demands respect.

The tradition of 時間湯, now renamed 伝統湯, carries that seriousness forward. A bath attendant still leads the rhythm of entry and immersion; it is not decorative heritage but a functioning practice. Elsewhere in town, 温泉まんじゅう sit in trays behind steamed glass, soft and plain in the way that things shaped by function tend to be. The 草津国際音楽アカデミー&フェスティバル brings chamber music each summer to this unlikely altitude, and the contrast — concert hall, sulfur smell, ski lifts dormant on the slope — is part of what makes Kusatsu feel like a place that has accumulated rather than been designed. The ベルツ記念館 holds the story of the German physician who studied these waters in the Meiji era, a reminder that the town has long attracted people trying to understand what, exactly, the water does.