'Back to the Beginning': A Journey

The Bible tells us the Garden of Eden was near four rivers. Two of them, the Tigris and Euphrates, are in modern-day Iraq, which leads scholars to believe the Garden was likely located in the fertile crescent region of Mesopotamia. The lush garden could have looked something like this Iraqi marsh. "Back to the Beginning," a two-part series, airs first on Friday, Dec. 21 at 9 p.m. ET on ABC. (Ghassan al-Yassiri/AP Photo)