The high-altitude salt flats of Salar de Uyuni in southwest Bolivia create the world’s biggest natural mirror.
Considered one of the flattest surfaces on Earth (4,086 sq mi), the salt flats are so big they can be seen from outer space.
The salt itself is up to 32 feet thick at the center. During the winter, a thin layer of water hovers over the salt creating the reflective mirror effect.
As the salt crystallizes from the saline oozing out of the mud cracks, the ridges in the salt flats also become hexagonal (see images 1 and 5 below).
Visitors to the location are known to take pictures that play with the perspective of the viewer’s depth.
Check out some of the photoshop-looking optical illusions video after the jump.