As Istanbul served as the capital for both the Byzantine and Ottoman empires, it has played a very important role in many modern and historical movements (including; religious, intellectual, political and cultural) and this can be seen and evidenced in the architecture of many of the city’s buildings and architecture. There are many sites that you was going to want to see here, and even though the city has more than 10million inhabitants, fortunately for the tourist, most sites in and around Istanbul are grouped around the “Golden Horn”, which is a body of water that separates Galata from Sultanahmet. There are many sites you are going to want to see here, and you could spend an easy week, but definitely start your tour around the Blude Mosque and the Haghia Sofya.