The Nazca Lines are a collection of large geoglyphs in the desert of southern Peru. They were formed by removing the surface layer of reddish stones to expose the white earth underneath. No one knows exactly when they were made, but most scholars guess between 500 BCE and 500 CE. Most are simple lines and geometric patterns, but several also represent the natural world, with designs including monkeys, spiders, birds, fish, and trees. Because of their isolation and dry climate, the lines have remained virtually unchanged throughout the years. They were designated a UNESCO World Heritage Site in 1994.

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Source: Wikipedia