b. Teotihuacán
Teotihuacán was the capital of the ancient civilisation of Aztec. It was founded by one of the groups of the Aztec people. This group was known as the Mexica. The city existed between 1325 to 1521. It was built on an island in Lake Texcoco, it wa sufficiently connected with hundreds of canals and causeways. The city was laid siege to and destroyed, by a Spanish conqueror. Before that siege, according to the conqueror himself, sixty thousand people came to the market place of the city and traded in goods of gold, silver, brass, wheels bones and feather.