The Carbonated Cure: Nagayu's Fizzing Springs & the Kuju Highlands — 2 Days

Nagayu's signature bath, in a playful black-and-white striped building with charred-cedar towers designed by the artist-architect Terunobu Fujimori. The outdoor carbonated bath runs cool by onsen standards, around 32°C, precisely so the CO2 stays dissolved and beads up over your whole body — the 'ramune' (soda-pop) effect the place is named for — beside a hotter milky indoor bath. As much an architectural experience as a soak.

Open ~10:00-22:00; adult ~¥500, child ~¥200; private family baths from ~¥2,000/hour, first-come (approx. 2026). In Nagayu Onsen, Taketa. The carbonated bath is deliberately tepid — stay in longer than a normal onsen to feel it.

Gani-yu is a tiny open-air bath built right into the bank of the Serikawa River in the middle of Nagayu, the most photographed spot in the village — emblematic of the old, unpretentious cure-town the place still is. Even if you only look, the riverside lanes around it are the heart of Nagayu: small bathhouses, a drinking-spring tap of carbonated water, and modest kitchens where lunch is easy. A gentle midday wander between soaks.

Gani-yu itself is a free, mixed open-air bath exposed to the street (more for the photograph and the atmosphere than a relaxed soak). Drink from the carbonated spring taps in town — distinctly fizzy and metallic. Several small eateries nearby make an easy lunch.

A modern wellness resort modelled on the German Kurort (cure-resort) tradition, with cottages on private decks above the Serikawa and a dedicated carbonated-spa building — indoor and outdoor bubbling baths, a walking 'kur' bath, and treatment spaces designed around the water's therapeutic claims. It is the most deliberately health-oriented stay in Nagayu, and the clearest expression of the village's reinvention as a serious cure town.

Cottage stays plus day-use of the carbonated spa building; rates vary by season (2026) — confirm directly. In Nagayu, a short distance from Lamune Onsen and Gani-yu. The spa's carbonated baths are tepid by design; pair with the walking bath for the full Kurort routine.

One of Japan's most dramatic castle sites: not a tower but a vast set of dry-stone ramparts riding a narrow ridge 325 metres above the valleys, their walls dropping away to forest on every side. Little is built up, which is the point — you walk the empty battlements with the Kuju mountains on the horizon. The ruins inspired the melancholy classic 'Kojo no Tsuki' ('Moon over the Ruined Castle'), and on a clear morning you understand why.

Reception ~09:00-17:00, closed Dec 31-Jan 3; admission ~¥300 adult (approx. 2026). About 20 minutes' walk or a short taxi from Bungo-Taketa Station. Sturdy shoes — the site is large, uneven and unfenced in places.

Below Oka Castle, Taketa keeps a quiet samurai-era townscape of stone walls, temple gates and a tunnel cut for a feudal lord. The composer Taki Rentaro, who wrote 'Kojo no Tsuki' picturing these very ruins, spent his boyhood here, and his preserved residence is now a small museum. It is an unhurried walking town — old shops, a few cafes for lunch — the human-scale counterpoint to the castle's grandeur above.

Taki Rentaro Residence open ~09:00-17:00, small admission (approx. 2026); the town itself is free to wander. Easy lunch among the old streets near Bungo-Taketa Station. Pair with the Taketa History & Culture Museum if you have time.

A high volcanic wetland on the Chojabaru plateau at the foot of the Kuju range, one of the largest moorland marshes in Japan and a Ramsar-listed site, crossed by an easy boardwalk loop. The flora shifts through the year — cottongrass and gentians in their seasons, golden grass in autumn — and the Kuju peaks rise straight ahead. A flat, restorative walk in big mountain air after the morning's climb and town.

Free; boardwalk open at all hours, starting beside the Chojabaru Visitor Center (which has displays and hours of its own). Bring a layer — the plateau sits around 1,000 metres and is cooler and windier than the valley. About 40-50 minutes by car from Taketa.

Japan's tallest pedestrian suspension bridge — 173 metres above the Naruko River gorge and 390 metres long — strung across the Kyusuikei valley with two big waterfalls in view and the Kuju mountains beyond. The deck sways gently and the floor grates let you see straight down, which is the thrill; the autumn colours through the gorge are the famous draw. A fittingly grand, slightly vertiginous close to a highland day.

Open ~08:30-17:00 (to ~18:00 in Sept-Oct); adult ~¥500, child ~¥200 (approx. 2026). In Kokonoe, about 15-20 minutes by car from Tadewara. Busiest and most spectacular in the autumn-colour weeks; it can close in high wind.