Plenty of national parks have spectacular scenic roadways, but there’s one that’s simply a must: Glacier National Park’s Going-to-the-Sun Road. The 50-mile drive, with visitor centers and campgrounds along the way, was cut out of the Montana mountainsides in the park’s interior, which means there are some sheer drop-offs — but also stunning views of the Rockies and Jackson Glacier along with agile bighorn sheep and mountain goats. The road climbs to 6,646 feet, and while portions remain open all year, the road isn’t typically fully open until late June, when the snow has melted, and it generally remains open until October. Always check the park’s website for weather conditions and periodic road construction. If you aren’t comfortable driving the twisty road but still crave the views, shuttles and tour buses are available.