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  The Pyramid of the Sun, Teotihuacan, Mexico   The Teotihuacan civilization in the central valley of Mexico began in 200 B. C.  It is estimated that at its maximum Teotihuacan contained more than 100,000 people, and its influence was felt as far away as Copan in Honduras.  Scholars estimate that it took 10,000 workers 20 years to erect the 12-square-mile site that includes the Pyramid of the Sun (700 ft. wide, 215 ft. high).