The Grand Teton National Park (mostly in Wyoming, but seen in this panorama from Idaho) is quite breathtaking in its majesty. The Tetons range has been probably named by French travellers (Grand Tetons is French for "Big breasts"; that's what happens when you let foreigners to name your geographic features). It is situated just north of Jackson Hole, WY, and immediately south of Yellowstone.
We travelled there in September of 2012, just before the snow season, but after the crowds went home. This also was an opportunity to put my E-M5 through its real-life paces (with the E-30 ready as a backup).
(With one or two exceptions, these images look best in a more elongated aspect ratio, that's why these are cropped to 8:5 and not 3:2 or 4:3).