Answer: Tenochtitlán ...the capital of Aztec empire.
Explanation: Mexico City was built exactly at the same place as Tenochtitlán which - symbolically speaking - is a mark of fundamental mixture, crealization or hybridization of Mexican culture. It did not happen in other place in Americas. In this sense Tenochtitlán is still here, still present and continues influencing soul of today´s Mexico.