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Covering about 2,800 square miles, Graubünden is the largest canton in Switzerland, occupying more than one-sixth of the country. With high mountains nestling chic resorts like St. Moritz, Davos, and Klosters, the Grisons (to use the French name) offers as much attitude as altitude. Cross any of the passes southeast to the Engadine Valley for quaint sgraffiti-covered villages and more fresh air than you can imagine.