Kamado Jigoku — Cooking Hell Steam Onsen Eggs

Kamado Jigoku (かまど地獄, 'Cooking Pot Hell') is the most hands-on of Beppu's seven hells — in addition to viewing colorful hot springs (including cobalt-blue pools and orange-tinted ponds), visitors can experience interactive geothermal phenomena: a drinking fountain dispensing safe-to-drink 80°C onsen water, a steam inhalation booth, and a foot bath using hell water cooled to 42°C.

The name derives from the Edo-period tradition of using this hell's steam to cook rice offerings for nearby Hachiman Shrine festivals — the steam rising from the ground resembled a giant cooking pot (kamado).