Peter Zumthor designed the spa/baths which opened in 1996 to pre date the existing hotel complex. The idea was to create a form of cave or quarry like structure. Working with the natural surroundings the bath rooms lay below a grass roof structure half buried into the hillside. The Therme Vals is built from layer upon layer of locally quarried Valser Quarzite slabs. This stone became the driving inspiration for the design, and is used with great dignity and respect