Istanbul is the ancient city of Constantinople was once capital of three empires Roman, Byzantian, and Ottoman. It is the city of history and amazing monuments, holding all the colours and contrasts together. Istanbul or the ancient city of Constantinople, once capital of three mighty empires Roman, Byzantian, Ottoman is a city of history and amazing monuments. It is at present Turkey’s economical and cultural capital. Surrounded by the Marmara Sea and the Black Sea, this important port city is positioned on both Europe and Asia. The character and charm of Istanbul lie in its unique variety of contrasts which one only can see in a few cities in the world. The eternal contradictions between east and west give a vibrancy and energy unmatched anywhere else. With its huge population, Istanbul is a city where more than 20 million people from different cultures live side by side.