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These 5 ancient cities once ruled North America—what happened to them?
Teotihuacan, Cahokia, and other metropolises featured striking religious centers, multifamily dwellings, and burial mounds, only to vanish. Archaeology is slowly revealing their splendid pasts.
Hot-air balloons drift over the Pyramid of the Moon, Pyramid of the Sun, and the arrow-straight Avenue of the Dead.
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