It was built in 537 AD and originally served as the seat of the Eastern Orthodox Church and Patriarch of Constantinople.
Maybe I like the colorful exterior. The hall on the first floor of the Sofia Church is empty and dark. The mosaic frescoes are on the second floor. Prepare instructions in advance and watch them together. You can also rent an explainer. If you go in April, the outside of the church will be all Are blooming tulips
Now it is free of ticket because they turn it back to an actual mosque. You can visit it out of praying times with respectfull outwear.
Hagia Sophia - former Christian Cathedral, later an imperial mosque. Built in AD 537. Breathtaking! Unusual mix of 2 religions. Entrance ticket - 72 TRY (in July 2019). The best time for visiting - 9 am, at that time you will have a chance to enjoy the beauty without hundreds of tourists.
Sultan Ahmet Mahallesi, Ayasofya Meydanı, 34122 Fatih/İstanbul