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The Quimbaya artifact: bird or ancient flying machine? Its craftsmanship hints at a mysterious past. The Quimbaya artifacts are a collection of gold objects made by the Quimbaya civilization, which flourished in Colombia's Cauca River Valley. Known for their extraordinary goldsmithing, they often used a gold-copper alloy called tumbaga. The most controversial pieces, sometimes called 'Quimbaya airplanes,' were found by looters in the late 19th century, not by archaeologists, which complicates un