Because of its glorious history, Istanbul is rich of monuments, as the superb Santa Sophia's, and Istanbul historical center is a UNESCO World Heritage Site.
Istanbul, Turkey
Istanbul, formerly Constantinople and Byzanthium, is situated on a peninsula with the Marmara Sea in the south and the Bosphorus Strait in the north and includes the natural harbor called the Golden Horn.
The originary nucleus was the byzanthine capital on the European side, which was later enlarged with other towns on the European coast as Galata and Pera, and on the Asian coast as Chrysopolis and Chalcedon, so that it is today the only city in the world spanning on two continents.