Balaban Aga Mosque - Credit: Wikimedia Commons
Balaban Aga Mosque (full name in Turkish: Balaban Ağa Mescidi, where mescit is the Turkish word for a small mosque) was a mosque in Istanbul, Turkey, converted from a former Byzantine building. Its usage during the Byzantine era is unclear. The small edifice - pulled down in 1930 to open a new road - was a minor example of architecture of the Byzantine early period in Constantinople. Read more on Wikipedia
Source: en.wikipedia.org