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Sechin Bajo is an archaeological site in Peru. This site is situated in the Casma Valley of Ancash, a region on the northwestern coast of that South American country. This site is believed to have served as the capital of a pre-Incan culture, and was occupied roughly between 1800 and 1900 BC. More recently, archaeological excavations at the site have unearthed a circular stone plaza amidst its ruins. This has been regarded as a major discovery, since, based on initial analysis, the structure was dated to around 3500 BC. If this is true, this would indeed be a significant find, as it means that the plaza is the oldest man-made structure in the New World. The Sechin Complex Sechin Bajo