Perhaps the most famous of geoglyphs, the Nazca Lines can be found in the Nazca Desert in southern Peru and have been declared a UNESCO World Heritage Site. Scholars believe they were created sometime between 200 B.C. and 500 A.D.
They consist of hundreds of figures, many of which depict animals such as hummingbirds (pictured here), sharks, monkeys, spiders, orcas, lizards and even an alleged "spaceman."
The purpose and meaning of the Nazca Lines remain a mystery today, though a number of theories have been posited. Some have hypothesized that they were intended to be seen by the Nazca culture's sky gods; others have suggested they may have an astronomical purpose. There are even those who suggest they were constructed to communicate with alien visitors.