Mourners carry the coffin of a victim of a bomb attack on a Baghdad cafe on Tuesday. Violence in Iraq has spiked this year. The bodies of 18 men were found Friday in a Sunni area near Baghdad. Sabah Arar/AFP/Getty Images hide caption

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Sabah Arar/AFP/Getty Images

Pakistanis check the site of a bomb blast in Karachi on Sunday. Pakistani officials say the blast has killed dozens of people in a neighborhood dominated by Shiites. Fareed Khan/AP hide caption

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Fareed Khan/AP

A fresco painting from the Chehel Sotun Pavillion in Isfahan, Iran, depicts Persian warfare during the Safavid dynasty period. Dave Bartruff/Corbis hide caption

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Dave Bartruff/Corbis

The Origins Of The Shiite-Sunni Split

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