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1. Baghdad, Iraq

The capital of Iraq, Baghdad, is lthe world's most dangerous city in Mercer’s rankings. Following the withdrawal of military forces from Iraq as of Dec. 31, the U.S. State Department and British Foreign Office warn their citizens against all but essential travel to Iraq. They add that those traveling there should do so only with a professional security company. Monthly car bombings and threats of attack against U.S. targets throughout Iraq continue, including in the "Green Zone" of Baghdad.

Methods of attack available to groups targeting U.S. interests have included roadside improvised explosive devices, car bombs, suicide bombs, land mines, mortars and shootings using various direct fire weapons. Numerous insurgent groups remain active throughout Iraq.

Photo: Ahmad Al-rubaye |AFP| Getty Images