Tehran is located in southern slopes of Alborz mountain. a large number of linguistic and ethnic groups live in Tehran. The city is vast so its climate varied from mild spring to cold and wet winters. Tehran was chosen as the capital of Iran in 1786. This city is home to many historical and natural attractions, including The National Museum of Iran, Azadi tower, Tabi’at Bridge, the royal complex of Golestan, Sa’dabad palace and many others. Tehran metropolis is equipped with the central terminals, railway stations and airports and a large network of highways and interchanges so make the city transportation system easy and comfortable. There are also considerable numbers of hotels, hostels and apartments which approved the city as the best tourism destination in Iran.