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 ...

Tucked within the peaks of the Himalayas at 4,300 meters (approximately 14,100 feet) above sea level, the Yangpachen Hot Springs are the highest hot springs in the world. But don’t just go jumping in!