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Wikipedia: Istanbul is the largest city in Turkey and fifth largest city proper in the world with a population of 12.8 million. Istanbul is also a megacity, as well as the cultural, economic, and financial centre of Turkey. The city covers 39 districts of the Istanbul province.
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![A view of the Haydarpaşa Terminal from the Sea of Marmara. [A view of the Haydarpaşa Terminal from the Sea of Marmara.]](http://images.ookaboo.com/photo/s/Haydarpasa_train_station_s.jpg)
![Maslak financial district [Maslak financial district]](http://images.ookaboo.com/photo/s/Maslak_kerembarut_s.jpg)
![A view of the Haydarpaşa Terminal from the Sea of Marmara. [A view of the Haydarpaşa Terminal from the Sea of Marmara.]](http://images.ookaboo.com/photo/s/Haydarpasha_train_station_istanbul_s.jpg)
![Electric multiple unit, TCDD E8000, running past the roman fortications along the coast on the European side in... [Electric multiple unit, TCDD E8000, running past the roman fortications along the coast on the European side in...]](http://images.ookaboo.com/photo/s/Istanbul_electric_train_by_coast_s.jpg)
![Originally a church, later a mosque, and now a museum, the 6th century Hagia Sophia built by Justinian was the... [Originally a church, later a mosque, and now a museum, the 6th century Hagia Sophia built by Justinian was the...]](http://images.ookaboo.com/photo/s/Hagia_Sophia_305_s.jpg)
![Skyscrapers, both near and far, soar above a dense layer of fog that keeps the ground hidden from view [Skyscrapers, both near and far, soar above a dense layer of fog that keeps the ground hidden from view]](http://images.ookaboo.com/photo/s/Fog_over_istanbul_skyscrapers_s.jpg)
![Fatih Sultan Mehmet Bridge. [Fatih Sultan Mehmet Bridge.]](http://images.ookaboo.com/photo/s/Fatih_Sultan_Mehmet_Bridge_panorama_s.jpg)
![The historical Beyoğlu Tünel station [The historical Beyoğlu Tünel station]](http://images.ookaboo.com/photo/s/Istanbul_Tuenel_station_Karakoey_s.jpg)
![Sakıp Sabancı Museum [Sakıp Sabancı Museum]](http://images.ookaboo.com/photo/s/Sakip_Sabanci_Museum_s.jpg)
![The Grand Bazaar is the oldest and one of the largest covered markets in the world [The Grand Bazaar is the oldest and one of the largest covered markets in the world]](http://images.ookaboo.com/photo/s/DSC04585_Istanbul_Bazaar_Foto_G_Dall_27Orto_29_5_2006_s.jpg)
![The Ottoman sultans ruled from the Topkapı Palace for centuries [The Ottoman sultans ruled from the Topkapı Palace for centuries]](http://images.ookaboo.com/photo/s/TopkapiSarayi_07_2006_s.jpg)
![The Boğaziçi University [The Boğaziçi University]](http://images.ookaboo.com/photo/s/Bosphorus_University_s.jpg)
![View of the Galata Bridge spanning the Golden Horn, with the Galata Tower in the background, ca [View of the Galata Bridge spanning the Golden Horn, with the Galata Tower in the background, ca]](http://images.ookaboo.com/photo/s/Bridge_and_Galata_Area_2C_Istanbul_2C_Turkey_by_Abdullah_Fr_C3_A8res_2C_ca_1880_1893_28LOC_29_s.jpg)
![Atatürk International Airport on the European side is the main airport of the city and one of the largest... [Atatürk International Airport on the European side is the main airport of the city and one of the largest...]](http://images.ookaboo.com/photo/s/Istanbul_Ataturk_Airport_International_Terminal_s.jpg)
![Traffic is usually intense on Bağdat Avenue [Traffic is usually intense on Bağdat Avenue]](http://images.ookaboo.com/photo/s/Ba_C4_9Fdat_Caddesi_7_s.jpg)
![The Princes' Islands are located to the southeast of Istanbul in the Sea of Marmara [The Princes' Islands are located to the southeast of Istanbul in the Sea of Marmara]](http://images.ookaboo.com/photo/s/Buyukada_1196_s.jpg)
![Sirkeci Terminal was opened in 1890 as the final destination terminus of the Orient Express [Sirkeci Terminal was opened in 1890 as the final destination terminus of the Orient Express]](http://images.ookaboo.com/photo/s/Bahnhofsfront_Istanbul_Sirkeci_retouched_s.jpg)
![Inside the Church of St. George in the Fener (Phanar) quarter. [Inside the Church of St. George in the Fener (Phanar) quarter.]](http://images.ookaboo.com/photo/s/Patriarchate_Constantinopolis_s.jpg)
![The modern funicular line running between Kabataş and Taksim. [The modern funicular line running between Kabataş and Taksim.]](http://images.ookaboo.com/photo/s/Funikuler_kabatas_taksim_s.jpg)
![View of the Ottoman Neo-Baroque style Ortaköy Mosque. [View of the Ottoman Neo-Baroque style Ortaköy Mosque.]](http://images.ookaboo.com/photo/s/Ortakoey_Istanbul_Bosporusbruecke_Mrz2005_s.jpg)
![Levent subway station. [Levent subway station.]](http://images.ookaboo.com/photo/s/Levent_metro_station_Istanbul_2_s.jpg)
![A modern tram running in the Galata quarter of Istanbul. [A modern tram running in the Galata quarter of Istanbul.]](http://images.ookaboo.com/photo/s/Tram_in_Galata_Istanbul_2_s.jpg)
![Istanbul Metropolitan Municipality City Hall (1960) in the Fatih district. [Istanbul Metropolitan Municipality City Hall (1960) in the Fatih district.]](http://images.ookaboo.com/photo/s/Istanbul_Metropolitan_Municipality_City_Hall_2_s.jpg)
![Maslak financial district. [Maslak financial district.]](http://images.ookaboo.com/photo/s/Maslak_financial_district_Istanbul_2_s.jpg)
![Commuter ferries have operated on the Bosphorus since 1837. [Commuter ferries have operated on the Bosphorus since 1837.]](http://images.ookaboo.com/photo/s/Istamboul_Kiziltropak_2_s.jpg)
![Snow is common in winter. [Snow is common in winter.]](http://images.ookaboo.com/photo/s/Istanbul_view_s.jpg)
![The Sultan Ahmed Mosque. [The Sultan Ahmed Mosque.]](http://images.ookaboo.com/photo/s/Blue_mosque2_s.jpg)
![Originally a church, later a mosque, and now a museum, the 6th century Hagia Sophia built by Justinian was the... [Originally a church, later a mosque, and now a museum, the 6th century Hagia Sophia built by Justinian was the...]](http://images.ookaboo.com/photo/s/Hagia_Sophia_exterior_2007_002_s.jpg)
![Main entrance gate of Istanbul University on Beyazıt Square, which was known as the Forum Tauri in the Roman period [Main entrance gate of Istanbul University on Beyazıt Square, which was known as the Forum Tauri in the Roman period]](http://images.ookaboo.com/photo/s/_C4_B0stanbul_C3_9Cniversitesi_s.jpg)
![Atatürk International Airport on the European side is the main airport of the city and one of the largest... [Atatürk International Airport on the European side is the main airport of the city and one of the largest...]](http://images.ookaboo.com/photo/s/Ataturk_Havalimani_2_s.jpg)
![Three historic quarters of Istanbul, looking south from Beyoğlu to the "historic peninsula" separated by the... [Three historic quarters of Istanbul, looking south from Beyoğlu to the "historic peninsula" separated by the...]](http://images.ookaboo.com/photo/s/Istanblue_s.jpg)
![Remains of a column from Byzantium's acropolis, which now reside within the Topkapı Palace complex [Remains of a column from Byzantium's acropolis, which now reside within the Topkapı Palace complex]](http://images.ookaboo.com/photo/s/Second_Court_Topkapi_2007_80_s.jpg)
![Levent financial district. [Levent financial district.]](http://images.ookaboo.com/photo/s/Levent_financial_district_in_Istanbul_s.jpg)
![Istanbul Park GP racing circuit. [Istanbul Park GP racing circuit.]](http://images.ookaboo.com/photo/s/Istanbul_Park_Turkish_GP_Circuit_s.jpg)
![City limits in 1922. [City limits in 1922.]](http://images.ookaboo.com/photo/s/Istanbul_PU889_s.jpg)
![Traditional waterfront houses on the Bosphorus. [Traditional waterfront houses on the Bosphorus.]](http://images.ookaboo.com/photo/s/Waterfront_houses_on_the_Bosphorus_1_s.jpg)
![A street view of a typical Ottoman mosque, complete with a plethora of arches along the façade, several domes... [A street view of a typical Ottoman mosque, complete with a plethora of arches along the façade, several domes...]](http://images.ookaboo.com/photo/s/S_C3_BCleymaniye_Mosque_2C_Istanbul_s.jpg)
![A crudely [A crudely]](http://images.ookaboo.com/photo/s/Map_of_Constantinople_281422_29_by_Florentine_cartographer_Cristoforo_Buondelmonte_s.jpg)
![The interior of a Hamam in Istanbul [The interior of a Hamam in Istanbul]](http://images.ookaboo.com/photo/s/Turkish_bath_28hamam_29_s.jpg)
![The Kanyon Mall, winner of the Cityscape Architectural Review Award [The Kanyon Mall, winner of the Cityscape Architectural Review Award]](http://images.ookaboo.com/photo/s/Kanyon_Mall_Istanbul_14_s.jpg)
![Istanbul Park GP racing circuit. [Istanbul Park GP racing circuit.]](http://images.ookaboo.com/photo/s/Istanbul_park_GP2_Ocean_Racing_s.jpg)
![The Grand Bazaar is one of the largest covered markets in the world. [The Grand Bazaar is one of the largest covered markets in the world.]](http://images.ookaboo.com/photo/s/Grand_bazaar_interior_s.jpg)
![The 4th century Hagia Irene was the first church built by Constantine in the new Roman capital city [The 4th century Hagia Irene was the first church built by Constantine in the new Roman capital city]](http://images.ookaboo.com/photo/s/Hagia_Eirene_Constantinople_2007_s.jpg)