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August 2, 2021UNESCO adds an ancient Peruvian solar observatory to its World Heritage Sites
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Iván Ghezzi, an archeologist and the director of the Chankillo project that was awarded the honor, discusses how the centuries-old system operated, and how it's still precise to this day. Produced by: Carol Hills. Image credit: Janine Costa/AFP via Getty/File photo.
Aired July 29, 2021
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