Hagia Sophia was built under Justinian in the sixth century, on the site of earlier churches. It was the cathedral of Constantinople, later a mosque, later a museum, and it is a mosque again. The dome, the marble, the mosaics that remain, and the roundels of calligraphy are all in one room. The longer journeys open or close here. Dress as the door asks.
Places
Hagia Sophia
The great church of Constantinople, on the Istanbul days.