An curved arrow pointing right. At a staggering 4,086 square miles, Bolivia's Salar de Uyuni is the biggest salt flat in the world. During the rainy season, it essentially turns into a giant mirror.

Fly over the haunting Train Cemetery of Uyuni, Bolivia, where rusting locomotives stand abandoned in the vast salt flats. This eerie graveyard of trains, once part of Bolivia’s railway boom, now ...