I have compiled evidence that the mysterious Nazca Lines of Peru were made by the Tiwanaku empire of Bolivia and not by people of Nazca, apparently to attract the attention of their flying sky god and direct him back to Tiwanaku. Though I speculate on ancient astronauts, the link between Nazca and Tiwanaku (which resolves the mystery of the purpose of the lines) remains strong regardless of whether the sky god was a real ancient astronaut or merely a figment of their imagination. My illustrated articles on this theme can be found at

http://mortenstgeorge.info/tiwanaku_alien_and_the_nazca_lines.html

Comments welcome.