Salar de Uyuni, Bolivia
Bolivia is the home of the largest salt flat in the world. It`s surface (for the most time of the year) is covered by salt crystals naturally arranged in geometric patterns. But the real magic happens during the rainy season (January-April) when the surface is covered with standing water which perfectly reflects the sky. This has to be one of the coolest natural effects in the world.
How to get there: First travel to the town of Uyuni and take a guided tour from there.