Mexico City was built on the remains of what city?

Mexico City was built on the remains of the Aztec city of Tenochtitlan. Tenochtitlan was founded in 1325 on an island in the middle of Lake Texcoco, and it quickly grew to become one of the largest and most powerful cities in the pre-Columbian Americas. In 1521, the Spanish conquistador Hernán Cortés led an expedition that conquered Tenochtitlan and destroyed much of the city. The Spanish then built Mexico City on top of the ruins of Tenochtitlan.