A study of Peru's Nazca Lines, uploaded to YouTube February 17th, 2008, by Lindasufos.
The Nazca Lines are a series of geoglyphs located in the Nazca Desert, a semi-desert that stretches 53 miles or more than 80 kilometers between the towns of Nazca and Palpa on the Pampas de Jumana in Peru. They were created by the Nazca culture between 200 BCE and CE 700. There are hundreds of individual figures, ranging in complexity from simple lines to stylized hummingbirds, spiders, monkeys, fishes, sharks, llamas and lizards.
The Nazca lines cannot be recognized as coherent figures except from the air. Since it is presumed the Nazca people could never have seen their work from this vantage point, there has been much speculation on the builders' abilities and motivations.