3. Salar de Uyuni in Bolivia
Salar de Uyuni in Bolivia is the world’s largest salt flat and biggest reserve of lithium, creating a 4,086-square mile mirror-like surface that reflects the sky. The area is a result of a giant prehistoric lake drying out 40,000 years ago, which left behind the salt desert. The best time to head down to Salar de Uyuni is during the winter rainy season to experience the feeling of walking among the clouds.