Iran is an Islamic republic in the zone of the Persian (Arabian) Gulf with historical monuments of the Persian Empire. One of them is the ruins of the ancient city of Persepolis, the capital of an empire founded in the 6th century BC. e. Darius I. In the current capital of the country, Tehran, there is the luxurious Golestan Palace, the residence of the Qajar dynasty from 1794 to 1925, as well as such modern buildings as the Borj-e Milad 435 meters high.