By utilizing its natural position over the only thermal springs in the Graubunden Canton in Switzerland and subterranean design, Peter Zumthor’s Therme Vals creates a multi-sensory experience that allows guests to freely roam through the various spas and bathing spaces of the cavernous form. The simplicity of the design and materiality choices create several unique atmospheres. Some spaces are open to the cold air of the valley, while others close the visitor in with natural skylights to guide them.