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People have lived in cities for thousands of years. Some ancient cities—for example, Rome or Shanghai—are now modern cities. Other ancient cities, like Teotihuacan and Tiahuanaco in the Americas, were abandoned many centuries ago. For a long time, people did not know very much about these cities. The inhabitants left no books or readable written records of their civilization.\n\nArcheologists, researchers who study human history by excavating settlements, studied the ruins of these cities. They have learned about the cities and their residents from the buildings, objects, and art that people left behind. While there are still many mysteries, researchers now know much more about Teoti
