Salar de Uyuni in southwest Bolivia Salar de Uyini is the world’s largest salt flats spanning 4086 square miles sq. km) in south-western Bolivia. Visitors worldwide visit this place during rainy season as this salty crust becomes a giant mirror
Travel: Austria's Green Lake in the Hochschwab Mountains is a hiking trail in the winter. The snow melts in early summer and creates a completely clear lake. The lake has a grassy bottom, complete with underwater trails, park benches, and bridges.