Tehran is Iran’s largest city and its capital and the center of Tehran province and Tehran county. Tehran city is located in north of Iran and south of Alborz mountains. Tehran is considered to be the 25th most populous city in the world. This city is one of the biggest cities of west Asia and 27th largest city in the world. The administrative structure of Iran is concentrated at Tehran. Azadi tower is the symbol of Tehran city. Also, Milad Tower is considered to be its, other, symbol. Tehran is sister with some of the other cities in the world such as Seoul, Los Angeles, Istanbul and etc.