The city known for the ancient ruins of Teotihuacan is located in Mexico, roughly 30 miles northeast of Mexico City. Teotihuacan was a major urban center between 100 BCE and 650 CE, famous for its large pyramids, including the Pyramid of the Sun and the Pyramid of the Moon. At its peak, this city was one of the largest in the world, and its impressive architecture and urban planning continue to astound archaeologists and visitors alike.