“Hot potting” is the practice of soaking in natural hot springs. Hot springs, also known as thermal springs, form when water seeps deep into the Earth and circulates back up. The deeper the rocks, the ...

Everything old is new again at Colorado’s hot springs, where recent expansions and upgrades have created fresh ways of savoring the Earth’s oldest bathtubs. A change in ownership transformed humble ...

From onsens in Japan to high-altitude pools in Bolivia, the photographer Greta Rybus shares highlights from her search for thermal waters. Looking out from the simple changing room at a hot springs ...