The Salar de Uyuni shortly after sunrise, the world's largest salt flat. I would have liked to have spent more time here but I was on a multi-day tour (one of the only tours I've ever taken, out of necessity) and they moved us along. The tour was four days and three nights but we only got about half a day on the salt flats, which was the point of the trip. Although the scenery we passed through to get there was very impressive.
Some of the otherworldly scenery surrounding San Pedro de Atacama in Chile. I spent a few days here organizing my trip to the Bolivian salt flats and took a couple of day tours while I was there.