This church/museum contains some of the most beautifully preserved mosaics in Istanbul. Unlike many churches here, it was never converted to a mosque. It is considered one of the most important artistic and historic sites in Istanbul.
If you are staying in the Sultanahmet, you may wish to take a cab here. This is a very popular site, and there will be many tour busses here. For the same reason, there is a small market and a touristy restaurant here, Asitane.
Details
Open every day except Wednesday from 09.30 to 18.00
Entrance fee: 7.000.000 TL
Nearby Attractions
Walls of Theodosius, Yedikule Fortress, Blachernae Palace, and Palace of the Porphyrgenitos.