Eminönü is a former district of Istanbul in Turkey, now a neighbourhood of Fatih district. This is the heart of the walled city of Constantine, the focus of a history of incredible richness. Eminönü covers roughly the area on which the ancient Byzantium was built. The Galata Bridge crosses the Golden Horn into Eminönü and the mouth of the Bosphorus opens into the Marmara Sea. And up on the hill stands Topkapi Palace, the Blue Mosque (Sultanahmet Camii) and Hagia Sophia (Aya Sofya). Thus Eminönü is the main tourist destination in Istanbul. It was a part of the Fatih district until 1928, which covered the whole peninsular area (the old Stamboul) within the Roman city walls - that area which was formerly the Byzantine capital Constantinople. Since the resident population of Eminönü is low today, it rejoined the Fatih district in 2009.