Thought so

Rico says that, while watching For Whom the Bell Tolls recently, he mused that the locations sure looked like the Sierras in California. Not Yosemite, precisely, but nearby. A quick jaunt to imdb.com got this:

It took 24 weeks to shoot the film (July to October 1942). The first twelve weeks were shot at Sonora Pass in the Sierra Nevada, while the last twelve weeks were shot at Paramount Studio in California.

Turns out, via Google Maps (and where would we be without them?), that Sonora Pass is less than fifty miles from Yosemite, so there you jolly well are, aren't you?
More to the point, just because a movie's become a classic doesn't mean it's classical. Even with all the great actors (Gary Cooper, Ingrid Bergman, Akim Tamiroff, and a host of other lesser-known actors, including Yakima Canutt and Yvonne De Carlo) and a good book (Ernest Hemingway, fer crissakes) behind it, it was still wooden.