At number one is Teotihuacán located on the bay of Mexico. There are a set of pyramid design like structures that are known locally as the Teotihuacán. History has it that the structure was built through the pre-Columbia age. This amazing place is made up of residential houses, murals as well as pyramids. It is actually believed that the place was a city to over 100,000 people. @Recently Active Users The area was settled by 400 BCE, but it did not experience large-scale urban growth until three centuries later, with the arrival of refugees from Cuicuilco, a city destroyed by volcanic activity. It is not known whether the basic urban plan also dates to that time. About 750 CE central Teotihuacán burned, possibly during an insurrection or a civil war. Although parts of the city were occupied after that event, much of it fell into ruin. Centuries later the area was revered by Aztec pilgrims.