Istanbul

Istanbul is one of the most beautiful and amazing historical cities ever, she's counted as one of world's patrimony of UNISCO since 1985. 14 million person live in Istanbul, which make it the second most populated city in europe after Moscow.
This wonderful city is located in two continents, Europe and Asia, But it's most conciderded as an European city because most of the historical sites are in the european side. It wasas the cultural capital of Europe in 2010.
Istanbul is also the 7th tourist destination in the world , with more than 9.4 visitors  in 2011.

So, if you were going to visit Istanbul, you should be so lucky because there's surely a lot to see in this city.