Cascate del Mulino, Saturnia

Bathers lie in the shallow limestone basins of the Cascate del Mulino below Saturnia in southern Tuscany, where warm water spills from one natural terrace to the next. The sulfurous spring water arrives at about 37.5°C (99.5°F) and smells faintly of eggs. Entry is free and the falls have no opening hours, so early morning or late afternoon is the best way to avoid the summer crowds.