Crossing over the lower half of MN and into South Dakota, there were fields upon fields of farmland covered with windmills. The winds were so high that waves of corn husks flew at my car, threatened to tip it over, and got stuck in the front grill, till my next stop for gas. But then you hit the middle of South Dakota and it's the most flat, boring drive ever, with nothing stretching for miles in every direction. Then, as you pass the Badlands and get closer to Mt. Rushmore, crossing over into Wyoming, some interesting little divots and rises in the land begin to show.