Chora Church- İstanbul / Turkey
Located in the Edirnekapi area of Istanbul, the Chora Church, Chora Mosque or Chora Museum (Kariye Müzesi / Kariye Camii / Kariye Kilisesi in Turkish) was originally built as a church and displays some of the finest examples of Turkish Byzantine mosaics and frescoes in its interior.
Hagia Sophia ( St. Sophia )
Hagia Sophia is a former patriarchal basilica, later a mosque, now a museum in Istanbul, Turkey. Famous in particular for its massive dome, it is considered the epitome of Byzantine architecture and to have "changed the history of architecture." It was the largest cathedral in the world for nearly a thousand years, until the completion of the Seville Cathedral in 1520. The current building was originally constructed as a church between 532 and 537 A.D. on the orders of the Byzantine Emperor Justinian, and was in fact the third Church of the Holy Wisdom to occupy the site (the previous two had both been destroyed by riots). It was designed by two architects, Isidore of Miletus and Anthemius of Tralles. The Church contained a large collection of holy relics and featured, among other things, a 15m (49 foot) silver iconostasis. It was the patriarchal church of the Patriarch of Constantinople and the religious focal point of the Eastern Orthodox Church for nearly one thousand years. It was the church in which Cardinal Humbert marched up to the altar and excommunicated Cerularius, marking the official start of the Great Schism.