Aya Sophya (Hagia Sophia) Church/Museum
The Church of Holy Wisdom, undoubtedly one of the greatest architectural creations in the world, was built by the Byzantine Emperor Justinian around 535 AD. It was transformed into a mosque after the Ottoman conquest of the city in 1453. Now a museum, it is awesome in size and contains beautifully preserved Byzantine mosaics. This church is an absolute must see.
