The city that was once the capital of the Aztec Empire is Tenochtitlán. Located on an island in what is now Mexico City, Tenochtitlán was a remarkable urban center. At its peak, it was the largest city in the Americas and showcased advanced architecture, including the impressive Templo Mayor. The city's strategic position on water allowed for a vibrant economy and access to resources. The fall of Tenochtitlán to Spanish conquistadors led to significant cultural shifts and the eventual establishment of Mexico City, deeply influencing Mexican history and identity.