The flats are nearly 12,000 feet above sea level and formed from transformations of several prehistoric lakes tens of thousands of years ago.
In the dry season, the planes are flat and crusty because of the salt (it's actually over 30 feet thick), but during the wet season, the flats are covered with a thin sheet of water that creates the amazing ice-like reflective surface.
Salar de Uyuni during the wet season
While you're in the area, you should definitely check out the Laguna Colorada, or the Colorful Lake in English. It's red because of the algae that lives in it and you won't be able to miss the bright coral flamingos that hang out there as well.
What are some of the coolest places you've ever been? Tell us below and we might write about it!