Perhaps the other times (on a bus with a weak stomach and in the back of a truck driven by two cops with machine guns) I was a little distracted to look out the window.
But in the Sierra Gorda region, I was stunned by the beauty of all the ecosystems we passed (desert, jungle, cloud forests, etc.) I kept wanting to stop to take photos, but sometimes the shoulder-less winding roads by the cliffs made it hard to pull over. Whenever we had a chance, though, we jumped out and soaked up the magnificence of the mountains. Each mile became more beautiful, more surreal.
As the sun went down and a fierce rain came, the drive became even more of a challenge. Temperatures dropped and suddenly we were driving through a cloud forest with about 10 feet of visibility (it also didn't help that our rental car had weak headlights!). I kept shrieking to Jeremy, "Don't look to the sides!" If he had looked to the sides like I did, he would have not been able to see anything but a white thickness. The scary part was that I knew we were right by the edge of the mountain.
Just as we thought we couldn't last much longer on the crazy road, a sign announcing our hotel popped up. We made it, and the breathtaking views definitely made the wild trek and my mild motion sickness :( worthwhile.