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The predecessors of modern astronomical observatories were monolithic structures that tracked the positions of the Sun, Moon, and other celestial bodies for timekeeping or calendrical purposes. The most famous of these ancient structures is Stonehenge, constructed in England over the period from 3000 to 1520 BCE. The Maya people of the Yucatán Peninsula in Mexico created a dome-shaped structure resembling a modern optical observatory around 906 AD. This art deco style statement is inspired by the structures that house the world’s biggest telescopes.