It's a church. It's a mosque. It's Hagia Sophia. - Kelly Wall

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If walls could talk, Turkey's Hagia Sophia would have an abundance of stories to tell. Once a church, then a mosque, and now a museum, this world marvel has stood the test of time and war, surviving centuries of conquest by some of history's greatest empires. Kelly Wall takes us through the history of each layer of this great jewel of human desire.

Lesson by Kelly Wall, animation by Andrew Foerster.