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The lines, located in the arid Peruvian coastal plain, were scratched on the surface of the ground between 500 B.C. and A.D. 500, are among archaeology's greatest enigmas because of their quantity, nature, size and continuity, according to UNESCO. “The geoglyphs depict living creatures, stylized plants and imaginary beings, as well as geometric figures several miles long. They are believed to have had ritual astronomical functions.”