I will try to explain in words what pictures don’t do, specially when we are dealing with Peter Zumthor work.
Peter himself does not like books or photos to describe his buildings, as in effect we are talking about sensations and experiences.
Its architecture is simple: mass and voids. When we put down the materials, then we start talking, whispering or even singing: stone and water. How many forms or smells or colors can water take?
In Vals water comes on any possible form, be it vapor, snow, ice and drops. And even color and smell have their character, from pools of flower to ferrous pools.
And about stone itself, well it can be cold, oh so very cold, or warm and almost hot. Light can shine on it and reflect as a mirror, or it can get as dark as the bottom of a pit.
Get there in winter to enjoy the Therms at their best, and make sure you order plenty of cheese fondue and spatzli in one of the restaurants on the way back.