Old open-pit coal mines in this non-Dubai city are being filled in to build its third international airport, projected to be the largest in the world. Cyrus Hamlin and a namesake philanthropist founded Robert College in this city. It contains an area known for two columns with Medusa-head bases, neither of which are right side up; that area, the Basilica Cistern, contains water that flows from its Belgrad Forest. Burgazada and Buyukada are two of the nine Prince Islands 
Old open-pit coal mines in this non-Dubai city are being filled in to build its third international airport, projected to be the largest in the world. Cyrus Hamlin and a namesake philanthropist founded Robert College in this city. It contains an area known for two columns with Medusa-head bases, neither of which are right side up; that area, the Basilica Cistern, contains water that flows from its Belgrad Forest. Burgazada and Buyukada are two of the nine Prince Islands in this city. The sarcophagus of Alexander the Great is found in this city's Archaeology Museums, which are located near Gulhane Park. This city's Seraglio Point is a promontory by its main natural harbor, the Golden Horn, and is the site of the Topkapi Palace. For 10 points, name this city on the Bosporus that straddles two continents and is the most populous city in Turkey.
Old open-pit coal mines in this non-Dubai city are being filled in to build its third international airport, projected to be the largest in the world.
Istanbul [prompt on "Byzantium" or "Constantinople"]