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flag A 1.5-km ancient site in Peru was a pre-Columbian marketplace and Inca tribute hub, used for trade and tax collection.

flag New research shows Monte Sierpe in Peru’s Pisco Valley—a 1.5 km site with 5,200 holes—served as a pre-Columbian marketplace and Inca tribute system, storing goods like maize and quinoa in woven containers. flag Its organized layout, with repeating numerical patterns resembling khipus, indicates it functioned as a trade and tax hub for at least 700 years.

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