Skiing in fog is a crapshoot—and usually a loser's bet. But when the fog settles in the valleys and the mountain juts above it, it's a heavenly experience. You ski the summit in brilliant sun, looking out over a sea of billowing white that floods the lowlands. Often, other skiers don't know there are blue skies up top. And we'll confess, we don't always tell them. If you're really lucky, the lifts will be laid out so that you can spend the entire day above it all—as close to heaven as you can get on earth.