Mukaitaki in Aizu is Japan's first designated Cultural Property inn. Five source-fed baths, Edo-period local cuisine, and exceptional hospitality await.

Stay at Nagasawa Heihachi, the iconic inn at Ginzan Onsen — snow-covered streets, all-wood private baths, and kaiseki dining in Yamagata.

Stay at Imagine Hotel Hakodate — 10 min from the airport, with ocean-view hot springs, all-you-can-eat snow crab dinner, and a salmon roe breakfast buffet.

Takamine Onsen in Nagano sits at 2,000m and is reachable by snowcat in winter. Open-air baths, alpine views, rare 36°C spring water, and wild animals await.

A full review of Tsurunoyu, the legendary thatched-roof ryokan deep in Akita's mountains. Milky sulfur baths, mixed-gender outdoor pools, 4 spring sources & mountain cuisine. Access from Tokyo included.

Trek across a suspension bridge to Yugawasou, a hidden Nagano gem. This healing sanctuary is known for its milky white baths and historic tubs covered in 50 years of mineral deposits.