Sechin Bajo is believed to be the oldest man-made structure in the Americas. The oldest parts of the ruins date back to around 3600 BCE and are part of a larger archaeological area known as the Sechin Complex (Sechin Bajo, Sechin Alto, Cerro Sechin, and Taukachi-Konkan).
In 2008, archaeologists unearthed a circular stone plaza dating to 3500 BCE and a nearby frieze dated to 3600 BCE. Both of the finds are the oldest examples of monumental architecture discovered in the Americas so far – they are older than anything found at Norte Chico, which is considered the oldest urban settlement of the Americas.
