Once a giant prehistoric lake, this 11,000-square-kilometre desert is now the planet’s largest salt flat. Take a 4WD tour across its glittering white expanse, marvelling at the beauty of this unique ecosystem that is home to not much except giant cacti and pink flamingos. In autumn, rain transforms the flats into a vast puddle that reflects the sky, making it impossible to tell where land ends and the heavens begin.