Originally Posted by Lonestar2112
I-15 heading out of Nevada into Utah, Virgin River Valley. It is a short stretch but beautiful and twisty!
Virgin River Gorge. Interstate 15's short run through Arizona between Littlefield, AZ and St. George, UT.
Another good slab stretch is I-80 between Salt Lake City and the Wyoming border.
This segment serves as a great contrast to what may be one of the absolute most boring stretches of slab in the world. I-80 from Tooele, UT to Wendover, NV.
I'll give another recommendation for I-70 through Glenwood Canyon, and I-84 through the Columbia River Gorge east of Portland, OR is also wonderful.