Salar de Uyuni
The Uyuni salt flat is a must see in South America in my opinion. Located in southwest Bolivia, it is the world’s largest salt flat. You can access it from the city of Uyuni, by bus or with a local tour. I went there at the beginning of April. I was lucky enough to see the mirror effect, which isn't there the whole year, only during the rain season, you can admire this miracle of the nature.