Nazca Lines

The small desert town of Nazca hosts the world’s largest sand dune and a series of markings in the desert that have baffled scientists since 1941. Now a UNESCO World Heritage Site and covering a huge area, the Nazca Lines are a mysterious collection of geometrical lines and shapes resembling, among others, a killer whale, hummingbird and monkey, and so large that they can only be appreciated from the air. The function of the ancient artworks, which pre-date the Incas by thousands of years, is still a mystery: some theorists talk of ancient running tracks or even landing strips for extra-terrestrials.