Best places to visit in Istanbul

Istanbul (UK: , or US: or ; Turkish: İstanbul [isˈtanbuɫ]), historically known as Byzantium and before 1924 as Constantinople, is the most populous city in Turkey and the country's economic, cultural, and historic center.
It's 10:10 right now , with overcast clouds and the temperature of 7.25°C (45.05°F) in Istanbul.