Hagia Sophia, Iznik (mosque) built
600 CE.
Shown on the map at 40.429°, 29.720°.
Hagia Sophia mosque (lit. 'the Holy Wisdom'; Ancient Greek: Ἁγία Σοφία, romanized: Hagía Sophía; Turkish: Ayasofya) in İznik (Nicaea) in Bursa Province, Turkey, was built as a Byzantine-era basilican church. Converted into the Orhan Mosque (Turkish: Orhan Camii) after the Ottoman conquest, it was turned into a museum in 1935. The church is now once again in service as a mosque. It is in the town centre of İznik, within the old walled area.
Text from the Wikipedia article Hagia Sophia, İznik, licensed CC BY-SA 4.0.