This is a modern mosque, called the Sabancı Merkez Cami (Sabancı is the name of an industrialist who financed it). When I first visited the city in 1992 they were building it. Some nine years later I had the pleasure of attending a prayer service on a Friday, with thousands of people in a huge, bright space with gorgeous domes, in the classical style, but with marble that was so white as one rarely sees it.