Due to the increasing significance of the city, gates, squares and mosques were built and it was at the time of Nassereddin Shah that the city's master sketch was prepared and modern streets were constructed. Later, huge central squares like Toopkhaneh square (now Imam Khomeini) and quite a few military buildings were built. Even though the Qajar dynasty was in a period of decline, Tehran soon took the shape of a modern city. The structure of large government buildings, new streets, recreation centres, urban service organizations, and academic and methodical centres were started, even as most of the old gates and buildings were destroyed and the city's old architectural fabric replaced by a contemporary one.
Tehran has also earned itself the rather unenviable reputation as a smog-filled, traffic-clogged and featureless sprawl of concrete bursting at the seams with 14 million residents. But you can also find an endless number of nice and cosy places in and around the city - if you know where to look. Tehran is also a city of parks and possesses more than 800 of them, all well-kept. The city is nearly a mile high above sea level and as a result is cooler than other cities in the middle east. Summer temperatures are around 32°C or about 90-95°F. The air tends to be very dry.
A combination of factors make Tehran a pleasant place to visit: The dry climate which is constantly cool (at least in the evenings), the proximity of the mountains, the parks and gardens where flowers blossom all through the year, the alleys of trees in the avenues or even smaller streets, and even the water that runs down from the upper city along deep and wide gutters which look like small rivers during spring. The Alborz range on the north of Tehran, which hosts Damavand -the highest peak in Iran- provides fantastic conditions for ski lovers in the winter. In winter, the mountain hotels and ski resorts at Shemshak, and Dizine are full several days a week. Some specialist skiers consider the snow value in northern Tehran to be one of the most excellent in the world. Skiing in Iran, Ski resorts of Tehran
The main feature of Tehran tourist centers are its interesting museums:
National museum of Iran
founded in 1937 and is known as the first Iranian archaeological museum. The National museum is divided into two sections based on different periods of Iranian history: PreIslam and Islamic periods.
Sa'd Abad Complex
Residential palaces of Mohamad Reza Shah, his father and some members of the former Iranian royal family . Its huge garden occupying an area of 410 hectares , makes Sad Abad the greatest cultural complex in modern Tehran consisting of 7 palace museums.
Carpet museum of Iran
inaugurated in 1977. It comprises of two halls and a vast basement where the best and finest Iranian carpets from different regions are displayed.
The National Jewels Museum
founded in 1937 inside the Central bank of Iran. This treasury is known as the richest single collection of Jewels in the whole world.