2. Valle de la Luna, Argentina
An extension of the Atacama Desert, the driest place on Earth, Argentina’s Valley of the Moon is a hauntingly beautiful yet inhospitable place of unique clay formations, sedimentary layers and enormous cliffs. A region of splendid natural history, Valle de la Luna is also the site of some of the oldest known dinosaur remains in the world. Since 2000, it has been listed as a UNESCO World Heritage Site.