Salar de Uyuni: One of the World’s Largest Mirrors, Bolivia.

The world's largest salt flat sits at a lofty 3653m (11,985ft) and blankets an amazing 12,000 sq km (4633 sq mi). It was part of a prehistoric salt lake, Lago Minchín, which once covered most of southwest Bolivia. When it dried up, it left a couple of seasonal puddles and several salt pans, including the Salar de Uyuni. From strange islands in a sea of blindingly bright salt to delicately colored mineral lakes in the Andean mountains, this is an unforgettable Bolivian landscape. However, travelers should take great care in choosing which tour operator to go with when visiting the salt flats. Fatal accidents due to unsafe vehicles and drivers are not unheard of. Make sure your vehicles have seatbelts, emergency radio transmitters and first aid equipment, and don't shy from asking about guides' levels of training and experience.

Of course, there are also many reputable tour operators in the area who will ensure your experience of this natural wonder is both memorable and safe. In the dry season, Salar de Uyuni is a surreal experience not to be missed. However, rain takes it to a whole new level. As a thin sheet of water covers the flats, it reflects a perfect representation of the sky above so that it is impossible to tell where sky ends and the land begins. The best time to visit Salar de Uyuni ultimately depends upon the experience you are looking for. For the best climate, we recommend you visit between July and October. However, for an increased chance of seeing the reflective surfaces, you should visit between March and April.