Teotihuacan is the most visited of Mexico's archaeological sites and a must-see if you're in Mexico City. The site is impressive for its scale, both in the size of the Pyramid of the Sun (the third largest pyramid in the world) and the majesty of the "Calzada de los Muertos (Street of the Dead) - originally 4 km long and flanked by temples, palaces and platforms.
This huge city of 20 million and over a mile high is built on the ruins of Tenochtitlan, the ancient Aztec capital. Reminders of past civilization pervade the city, particularly at the Templo Mayor excavation and Anthropological Museum at Chapultepec Park. Fine shops can be found in profusion in the Zona Rosa and Polanco. In this small piece od the country (0.00000005% of total area, there are the 20% of population, 35% of automotor vehicles, and 40% of telephones.
Mexico City, called D. F. (for Distrito Federal; Federal District) or simply Mexico, is the capital, seat of government and the center of commerce, finance and the arts; in addition to being the largest city in the world.