Domes of Ayasofya
The domes of Ayasofya - built as a church in the 500s and turned into mosque from 1500s onwards. The 55.6m high dome with 31 m diameter was built in 560 after the previous dome collapsed in an earthquake. It has remained in place since.
AyasofyaHagia SophiaTurkeydomebyzantineByzantine architecture