30+ years of field experience
From Japanese onsen protocol to European spa customs — know the unwritten rules before you arrive.
Read guide → PlanningResort spa or backcountry wild spring — the packing list changes completely. Here's what you actually need.
Read guide → SafetyWhat the temperature numbers actually mean, how traditional bathing cultures have approached immersion time, and what to watch for outdoors.
Read guide → DestinationJapan has more registered hot spring resorts than any other country. A field guide to its regions, traditions, and most remarkable destinations.
Read guide → techniqueAlternating hot and cold water immersion is one of the oldest thermal bathing practices in the world. This guide explains its history, its logic, and how to approach it sensibly.
Read guide → traditionFor centuries, visitors to European spa towns came not to bathe, but to drink. The history of the drinking cure, and where to experience it today.
Read guide → planningA practical guide to reading the mineral composition of a hot spring — no chemistry degree required.
Read guide →