Dec. 25, 2013: Iraqi Christians light candles after a Christmas mass at St. Joseph's Chaldean Church in Baghdad, Iraq, Wednesday, Dec. 25, 2013.
Dec. 25, 2013: Pope Francis delivers his "Urbi et Orbi" (to the City and to the World) message from the central balcony of St. Peter's Basilica at the Vatican.
Dec. 25, 2013: An Iraqi Christian woman lights candles before a Christmas mass at the Mother Teresa Catholic Church in Basra, Iraq's second-largest city, 340 miles (550 kilometers) southeast of Baghdad, Iraq.
Dec. 25, 2013: Britain's Prince William, left, accompanied by his wife Kate, Duchess of Cambridge, arrive to attend a Christmas Day Service with other members of the royal family at St. Mary's church on the grounds of Sandringham Estate, the Queen's retreat, in Norfolk, England.
Dec. 25, 2013: An Indian nun receives a communion wafer from a priest during Christmas in a church in Gauhati, India.
Dec. 25, 2013: Syrian and Iraqi Orthodox Christian refugees attend morning Christmas mass at the Saint Afram Syrian Orthodox Church in Amman, Jordan.
Christians celebrate the birth of Jesus around the world.