The oldest solar observatory in the Americas has been discovered in coastal Peru, archeologists from Yale and the University of Leicester announced today. The 2.300-year-old ceremonial complex featured the Towers of Chankillo, 13 towers running north to south along a low ridge and spread across 300 meters to form a toothed horizon that was used for solar observations.

Peruvian Citadel is Site of Earliest Ancient Solar Observatory in the Americas