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Photo by: Karim Kadim

Shiite pilgrims march on their way to Karbala for Arbaeen in Baghdad on Dec. 31, 2012. Each year, hundreds of thousands converge on the southern city of Karbala to mark the end of the forty day mourning period following the anniversary of the 7th-century death of the Prophet Muhammad's grandson, Imam Hussein. Many pilgrims travel on foot and the mass gatherings are frequently attacked despite tight security. (Associated Press)

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