Unzen Jigoku

Unzen Jigoku in Nagasaki is an otherworldly geothermal landscape defined by active, steaming fumaroles. Visitors explore the terrain via wooden boardwalks that wind past natural vents, where resident friendly cats are often spotted warming themselves on the heated stone ground.

Commenters show widespread enthusiasm and curiosity, with several regretting that they bypassed it during past visits to Nagasaki. Others engage with the endearing cats and actively inquire about practical onsen rules, particularly regarding tattoo accommodations.