Star architect fear for his masterpiece

The remote alpine village of Vals in the eastern Swiss canton of Graubünden rose to fame when star architect Peter Zumthor built new thermal baths there in 1996. The spa is well known for its quarzite slab construction. Now the surrounding hotel complex is in need of renovation. An investor has offered to buy the whole site, but Zumthor fears for the future of his masterpiece.