The mineral-rich soak at Chena Hot Springs, about 60 miles northeast of Fairbanks, has been attracting tourists since the early 1900s. Cavan Images/Getty Images On the frozen Alaska tundra, hot ...

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 ...