St. Catherine's Monastery's Secret

Catherine's Monastery in Egypt is home to the world's oldest continuously operating library, built in the 550s AD by order of Emperor Justinian I. It houses one of the largest collections of early Christian icons, including the earliest known depiction of Jesus as "Christ Pantocrator." The library also received a letter from the Islamic prophet Muhammad, stating, "This is a message from Muhammad ibn Abdullah, as a covenant to those who adopt Christianity, near and far, we are with them. "