heres something i never knew off 
.. just saw on a documentry on TV.. so i thought mght do some research myself 
pretty interesting…
The Nazca Lines in PEru
The Nazca lines are geoglyphs and geometric line clearings in the Peruvian desert. They were made by the Nazca people, who flourished between 200 BCE and 600 CE along rivers and streams that flow from the Andes. The desert itself runs for over 1,400 miles along the Pacific Ocean. The area of the Nazca art is called the Pampa Colorada (Red Plain). It is 15 miles wide and runs some 37 miles parallel to the Andes and the sea. Dark red surface stones and soil have been cleared away, exposing the lighter-colored subsoil, creating the “lines”. There is no sand in this desert. From the air, the “lines” include not only lines and geometric shapes, but also depictions of animals and plants in stylized forms. Some of the forms, including images of humans, grace the steep hillsides at the edge of the desert.
The Nazca lines are communal. Their creation took hundreds of years and required a large number of people working on the project. Their size and their purpose have led some to speculate that visitors from another planet either created or directed the project. Erich von Däniken thinks that the Nazca lines formed an airfield for alien spacecraft*, an idea first proposed by James W. Moseley in the October 1955 issue of Fate and made popular in the early sixties by Louis Pauwels and Jacques Bergier in The Morning of the Magicians. If Nazca was an alien airfield, it must have been a very confusing airfield, consisting as it does of giant lizards, spiders, monkeys, llamas, dogs, hummingbirds, etc., not to mention the zigzagging and crisscrossing lines and geometric designs. It was very considerate of the aliens to depict plants and animals of interest to the locals, even though it must have meant that navigation would be more difficult than a straight runway or a large clearing. Also, the airport must have been a very busy place, needing 37 miles of runway to handle all the traffic. However, it is unlikely spacecraft could have landed in the area without disturbing some of the artwork or the soil. There is no evidence of such disturbance.
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The alien theory is proposed mainly because some people find it difficult to believe that a race of “primitive Indians” could have had the intelligence to conceive of such a project, much less the technology to bring the concept to fruition. The evidence points elsewhere, however. The Aztecs, the Toltecs, the Inca, the Maya, etc., are proof enough that the Nazca did not need extraterrestrial help to create their art gallery in the desert.
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In any case, one does not need a very sophisticated technology to create large figures, geometrical shapes, and straight lines, as has been shown by the creators of so-called crop circles. The Nazca probably used grids for their giant geoglyphs, as their weavers did for their elaborate designs and patterns. The most difficult part of the project would have been moving all the stones and earth to reveal the lighter subsoil. There really is nothing mysterious about how the Nazca created their lines and figures.
Some think it is mysterious that the figures have remained intact for so many hundreds of years. However, the geology of the area solves that mystery.
