Istanbul (Turkish: İstanbul ) is the most populous city of Turkey and the center for culture, commerce, finance and media. The urban area stretches along the north shore of the Marmara Sea on both sides of the Bosphorus, the strait between the Mediterranean and Black Sea. Due to this situation , both in the European Thrace and Anatolia in Asia Istanbul is the only metropolis in the world that is situated on two continents.The urban settlement area is home to about 13.7 million inhabitants, which occupies the fourth place among the most populous cities in the world . With two central terminal stations , numerous remote bus stations, two major airports and a distinctive waterway Istanbul is the largest transportation hub in the country. His transit location between two continents and two marine areas makes it an important station of the international logistics.
The metropolis built under the name of Chalcedon and Byzantium can since the founding of their original neighborhoods look back on 2600 years of history, in which she served three great empires as its capital. The architecture is characterized by ancient, medieval , modern and contemporary architectural styles last , it combines elements of the Greeks, Romans, Byzantines, Ottomans and Turks together to form a cityscape. Because of this uniqueness of the historic center of the UNESCO declared World Heritage Site. For a long time Istanbul was an important center of Orthodox Christianity and Sunni Islam . It is the seat of the Ecumenical Patriarch and has numerous mosques, Cemevleri , churches and synagogues.