Known traditionally as the Fuente de Juventud (Fountain of Youth), the Chancos thermal baths, 30km north of Huaraz, consist of a series of natural saunas inside caves, with great pools gushing hot water in a beautiful stream. It is claimed that the thermal waters are excellent for respiratory problems, but you don’t have to be ill to enjoy them, and they make an ideal end to a day’s strenuous trekking.