While Yellowstone, Grand Canyon and Yosemite might get more attention than other national parks, Glacier National Park in Montana may take the cake as the most breathtaking. There is no shortage of amazing views along the 730 miles (1,174 kilometers) of hiking trails throughout the park. The park is known for its tall mountain peaks, isolated alpine lakes, abundant wildlife and, of course, the glaciers. It does indeed get its name from the huge glaciers that helped to shape the park's signature rock formations 10,000 years ago. In 1850, the park had 150 glaciers, but sadly only 26 now remain because of the effects of climate change on this high-altitude treasure. Don't forget to take the snow line into account. You'll have to wait until mid-June for a snow-free hike in the lower elevations, and as long as late July for the higher elevations.