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A visitor walks in front of one of the pyramids in the ancient city of Caral in the Supe valley, north of Lima October 29, 2011, marking 17 years of research into the ancient city. Archaeologists have made scores of discoveries in 17 years of digging in a complex of stone temples, altars and pyramids, which dates back some 5,000 years, unearthing evidence of sophisticated engineering and design skills. Picture taken October 29, 2011. REUTERS/Pilar Olivares (PERU - Tags: SCIENCE TECHNOLOGY SOCIETY TRAVEL)
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