Tehran is the capital of Iran and Tehran Province. With a population of around 8.8 million in the city and 15 million in its larger metropolitan area, Tehran is the most populous city in Iran and Western Asia, and it has the second-largest metropolitan area in the Middle East. It is ranked 29th in the world by the population of its metropolitan area.
Tehran’s most famous landmarks include the Azadi Tower, a memorial built in 1971 under the reign of Mohammad Reza Pahlavi to mark the 2,500th year of the foundation of the Imperial State of Iran, and the Milad Tower, the world’s sixth-tallest self-supporting tower which was completed in 2007. The Tabiat Bridge, a newly-built landmark, was completed in 2014.
Tehran is served by the international airports of Mehrabad and Khomeini, a central railway station, the rapid transit system of Tehran Metro, a bus rapid transit system, trolleybuses, and a large network of highways.