The capital city of Turkey is Ankara.
It is important to note that Turkey is not divided between Europe and Asia (in terms of subnational regions). The region with the entirety of Europe in it is the Marmara Region which also has areas from northwest Anatolia (with roughly the same area). This region, however, is cultural, as opposed to administrative and therefore has no capital. Istanbul does serve as capital of Istanbul Province, which is on both sides of the Bosporus.
See the related link for an image of the Marmara Region.
Istanbul is on the Eastern side of Europe.
Istanbul on the Bosphorus.
Byzantium is an ancient name for the modern city of Istanbul. Part of Istanbul is in Europe and part of it is in Asia.
Istanbul
Istanbul is located on two continents: Asia and Europe.
Istanbul
Istanbul is on the edge of two major regions: the Balkans (in Europe) and Anatolia (in Asia).
Constantinople- commonly known as Istanbul (in Turkey) is located in both Asia and Europe
Istanbul, the city that straddles two continents.
Istanbul
Istanbul
Asia and Europe.