Hagia Sophia's Secret

The Hagia Sophia, a prominent landmark in Istanbul, Turkey, was originally a Christian church before it was converted into a mosque. The city was violently conquered by the Ottomans, who murdered and raped citizens for three days with approval from their sultan. All those who held liturgies in the Hagia Sophia were killed. The mosque also sits atop an ancient series of underground tunnels, 800 feet beneath its foundation. A documentary crew, granted rare permission to explore these tunnels, discovered sealed passages, a graveyard with children's bones, and the burial chamber of the first priest of Hagia Sophia.