Hagia Irene

This Eastern Orthodox church in the Topkapi Palace’s outer courtyard is currently considered the oldest church in the city—though it has had to be rebuilt several times since its initial construction in the 4th century. It is also the only known church in Istanbul to have never been converted to a mosque. Today, it acts as a concert hall, and though it’s not much of a looker on the inside, the acoustics are excellent.

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