Salar de Uyuni, the largest salt flat in the world (by far), is maybe the most surreal landscape I’ve ever visited. I expect it might take going to Antarctica to see something quite as interesting. But even then, we’re somewhat used to seeing pictures of vast swathes of ice and snow; when it’s perfectly flat salt, it’s strange!
I went on a 3-day tour of southwest Bolivia that began in the town of Uyuni and spent the first full day on the flats. Wikipedia says it’s 3,656 meters (11,995 ft) above sea level, and so flat (varies only +/- 1 meter) that satellites use it for calibration. Since I was visiting in April, part of the dry season, we could drive all over the flats.
It’s both hot and bright on Salar de Uyuni; without good sunglasses, “snow blindness” (salt blindness in this case) would quickly become an issue.
I was extremely happy with Red Planet, the local tour operator.