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1. The I-15 from Las Vegas to Salt Lake City
The I-15 runs all the way from San Diego to Montana, but if you want to plan a scenic trip, carve out the leg between Nevada and Utah. Not only will it take you past the Grand Canyon's south rim, but you'll be close enough to stop at all the hot spots, like the Hoover Dam, Lake Powell, Zion National Park and Antelope Canyon, just to name a few.