Tehran is the capital and largest city of Iran. It has a population of 8 million and is the 25th most populous city in the world. This city has many places, no matter what the traffic, and its air pollution, it is a sight to behold. Saad Abad Historical Cultural Complex is a collection of mansions and palaces built in Darband, the northern most affluent and most humid area of Alvand, on a land of 2 hectares. The complex has about 1 hectare of natural forests, springs, aqueducts, gardens, greenhouses and streets.  It is bounded on the north by the