I ran across this project while searching for the wall sections of Peter Zumthor's Vals Baths. Mario Botta, whose projects I've covered before, completed a the Tschuggen Bergoase Spa in Arosa, Switzerland in 2006. The 57,000 sq. ft, $30.3 million USD building was meant to hide is mass in the hillside, showing itself to the outside mostly in the form of light 'trees', the large glass leaf looking structures that let in light during the day and glow at night.
Botta is very good at quiet, intimate space, and looks like he's scored another home run here. I'll have to swing by on my next trip to Switzerland.
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Where in the World - Arosa, Switzerland