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.
In the Classical era, part of the territory of present-day Tehran was occupied by Rhages, a prominent Median city. It was subject to destruction following the Arab, Turkic, and Mongol invasions. Its modern-day inheritor remains as an urban area absorbed into the metropolitan area of Greater Tehran.
Tehran was first chosen as the capital of Iran by Agha Mohammad Khan of the Qajar dynasty in 1796, in order to remain within close reach of Iran's territories in the Caucasus, before being separated from Iran as a result of the Russo-Iranian Wars, and to avoid the vying factions of the previously ruling Iranian dynasties. The capital has been moved several times throughout the history, and Tehran is the 32nd national capital of Iran.
The city was the seat of the Qajars and Pahlavis, the two last monarchies of Iran. It is home to many historical collections, including the royal complexes of Golestan, Sa'dabad, and Niavaran, as well as the country's most important governmental buildings of the modern era.
Large scale demolition and rebuilding began in the 1920s, and Tehran has been a destination for the mass migrations from all over Iran since the 20th century.
Tehran's most famous landmarks include the Azadi Tower, a memorial built under the reign of the Pahlavi dynasty, 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.
The majority of the population of Tehran are Persian-speaking people, and roughly 99% of the population understand and speak Persian, but there are large populations of other Iranian ethnicities such as Azerbaijanis, Armenians, Lurs, and Kurds who live in Tehran and speak Persian as their second language.
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.
There have been plans to relocate Iran's capital from Tehran to another area, due mainly to air pollution and the city's exposure to earthquakes. To date, no definitive plans have been approved. A 2016 survey of 230 cities by consultant Mercer ranked Tehran 203rd for quality of life. According to the Global Destinations Cities Index in 2016, Tehran is among the top ten fastest growing destinations.