The center of the Aztec civilization was the Valley of Mexico, a huge, oval basin about 7,500 feet above sea level. The Aztec empire included many cities and towns, especially in the Valley of Mexico. The largest city in the empire was the capital, Tenochtitlan. The early settlers built log rafts, then covered them with mud and planted seeds to create roots and develop more solid land for building homes in this marshy land. Canals were also cut out through the marsh so that a typical Aztec home had its back to a canal with a canoe tied at the door.  The story of the Aztecs' rise to power is awe inspiring one, and is one of the most remarkable stories in world history. They were a relatively unknown group of people who came into the Valley of Mexico during the 12th and 13th century A.D., and rose to be the greatest power in the Americas by the time the Spaniards arrived, in the 16th century.  Even so there is a strong Aztec doomsday prophecy element in the culture.

More about Doomsday in Ancient Indian Prophecy.