The Nazca Lines are the most famous geoglyphs in the world. Dating back around 2,000 years and reaching a combined length of more than 800 miles (1,300 kilometers), they depict a variety of motifs, including humans, animals, geometric shapes, plants and flowers. These designs were constructed on the arid hills and valleys of coastal Peru by the Nazca people between 200 B.C. and A.D. 500, long before writing was used in the region.It's not clear exactly how many Nazca Lines there are, but they number in the thousands, with new geoglyphs continuing to be discovered with the help of AI.But why were the Nazca Lines built?Scientists have been debating this question since the lines were first form...