Tehran is not Iran, but without this great metropolis, it would not be possible to fully comprehend the ever changing Iran. Tehran is the mirror of Iran. Contemporary Tehran is a modern city featuring many structures, of which the Azadi (Freedom) Tower and the Milad Tower have come to be symbols of Tehran itself. In 2008 Tehran was the least expensive capital in the world and the second-least expensive city globally based on the cost-of-living index, presenting the best value for money in the world.

During the Sassanid era, Yazdegerd III in 641 issued from Ray his last appeal to the nation before fleeing to Khorasan. The sanctuary of Bibi Shahr-Banu situated in modern Tehran spur and accessible only to women is associated with the memory of the daughter of Yazdagird who, according to tradition, became the wife of al-Husayn b. Ali, the third Shi'ite Imam. At the time of the Zand dynasty, it was a small town that was significant from a military point of view. The first of the Qajar kings, Agha Mohammed Khan, named Tehran as the country's capital in 1778. Nevertheless, the capital's development started at the time of another Qajar monarch, Fath-Ali Shah. The citadel, which Agha Mohammed Khan had built, was developed to include the new royal buildings.

In the 1960s and 70s Tehran was rapidly developing under the reign of Shah Mohammad Reza Pahlavi. Modern buildings altered the face of Tehran and ambitious projects were envisioned for the following decades. The majority of these projects were continued after the Islamic revolution of 1979 when Tehran's urbanization had reached its peak, and the new government started many other new projects, such as Milad Tower.

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