A sloping glass roof opens this penthouse to the Mischabel mountains and sky. Sweat it out in the gym or sauna, use your private key to take the lift past the warm, wooden interior to bird's-nest views of Zermatt, and sip hot chocolate in the library or on the balcony. Featured in several mags, the designer home includes a chef, host, and open bar, and you're 8 minutes to the nearest ski lift.