Mount Rainier National Park's Sunrise Road climbs to a 6,200' ridge where you get an incredible view of Mt. Rainier's 14,411' top. You can stand there and just watch the lenticular clouds form and reform over the peak.
This photo, btw, was posted directly from Lightroom, using Tim Armes' great export plugin LR/Blog. Very cool. At $12.60, it's a major bargain. You can see it and a bunch of other Lightroom plugins at The Photographer's Toolbox.