Les Bains du Mont Blanc (Thermes de Saint-Gervais)

The public thermal spa of the Saint-Gervais baths, at the end of the thermal park in Le Fayet at the bottom of the Bonnant gorge, using water that the operator dates at 6,500 years old by carbon 14 and that rises at 39 °C. Dark ground-floor rooms follow the water's journey through the rock, four outdoor pools at different temperatures sit in the gorge, and the upper floor has a salt grotto, an alpine garden and a sauna built like a mountain refuge.