From the first through the seventh centuries, the city of Teotihuacan flourished. Located northeast of modern Mexico City, Teotihuacan had a maximum population of approximately 200,000 and was the first major city in the Western Hemisphere. The city was graced with the Pyramid of the Sun and the Pyramid of the Moon. Teotihuacan should not be confused with the Aztec city of Tenochtitlan, which was built nearly six centuries later in the area that is now known as Mexico City.