Geocachers hoping to log a smiley for Salar de Uyuni (GC2M6GC) encounter one of the world’s largest salt lakes. Werwolfi created the difficulty 3, terrain 4 EarthCache at the beginning of 2011. The cache page reads, “Driving across it [Salar de Uyuni] is one of the weirdest and most fantastic experiences anywhere on the continent, especially during June and July, when the bright blue skies contrast with the blinding white salt crust and in the rainy season they turn into a gigantic mirror.” To log the cache, adventurers must explore the geological site and answer two questions on the cache [...]