There is a small but very unforgettable section of I-15 in the NW corner
of Arizona. The warning you get before talks about strong crosswinds…but we
didn’t experience that. Instead it is a stretch of road with no safe place to pull
over and maintenance work going on but GORGEOUS views.
According to Wikepedia, this is one of the most expensive interstate
highways ever constructed. Given the amount of rock they must have moved. I can
understand that.
From online “I-15 through the Virgin River Gorge is a scenic wonder through a 500
million-year-old gorge. Construction of I-15, which opened in 1973, included
re-channeling the Virgin River 12 times. "Somehow," Arizona Highways
magazine said in 1988, construction of I-15 "enhanced rather than
distracted from nature's handiwork."”
BTW, it is difficult to take pictures since it must all be from the car
windows (which aren’t perfectly clean) and it is so BIG. Hopefully you can see
it yourself sometime.