One of the most beautiful places I've been is along the Going to Sun Road in Glacier National Park. The Park is just one of those places you must visit to understand some of the extreme beauty Nature has to offer.
Check out this Lonely Planet Guide to some of the National Parks in North America when you plan your next trip up north. Color photos and hiking maps for Banff, Jasper & Glacier National Parks.
Lonely Planet: Banff, Jasper & Glacier National Parks by Miller, Derby, and Lukas.
Catherine @ Reading In Montana