Molla Zeyrek Mosque in Fatih

You're standing at Zeyrek Camii, the Zeyrek Mosque, in the Zeyrek district of Fatih, looking out over the Golden Horn. Take a good look at the building, because it's really three buildings in one. Two Byzantine churches and a chapel were joined together here. Together they are the best example of Middle Byzantine architecture in Istanbul. After Hagia Sophia, it's the largest Byzantine religious building still standing in the city.