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Tehran is the capital and largest city of Iran, and the administrative center of Tehran Province. Tehran is a sprawling city at the foot of the Alborz mountain range with an immense network of highways unparalleled in Western Asia. Tehran is famous for its numerous ski resorts on the Alborz slopes, large museums, art centers, and palace complexes. Tehran is the second largest city in the Middle East and is the second most populated city in South Western Asia with a population of 7,404,515 and approximately 15 million in Greater Tehran.
Most Iranian industries are headquartered in Tehran. The industries include the manufacturing of automobiles, electrical equipment, military weaponry, textiles, sugar, cement, and chemical products. It is also a leading center for the sale of carpets and furniture. There is also an oil refinery located in south of the city.
In the 20th century, Tehran faced a large migration of people from all around Iran. Today, the city contains various religious minorities, and has many historic mosques, churches, synagogues and Zoroastrian fire temples.
For more information please refer to the following sites: http://en.wikipedia.org/wiki/Tehran & www.itto.org