The 50 most unforgettable photos of 2015

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From the Charlie Hebdo attacks in Paris at the start of the year to the ongoing war in Syria and political uncertainty around the globe, 2015 has been tense. As it wraps up, here are 50 of the most unforgettable images of 2015.

A man holds a giant pencil as he takes part in a solidarity march in Paris on January 11. The march follows the horrific attacks by gunmen at the offices of the satirical weekly newspaper Charlie Hebdo, the killing of a policewoman in Montrouge, and the hostage taking at a kosher supermarket at the Porte de Vincennes.

Law enforcement officers stand, with some turning their backs, as New York City Mayor Bill de Blasio speaks on a monitor outside the funeral for NYPD Officer Wenjian Liu in Brooklyn on January 4. Tens of thousands of law-enforcement officers from across the country gathered for the funeral of the second of two NYC policemen killed last month in an ambush that galvanized critics of the mayor.

An activist kicks the shields of the military police officers during a demonstration in the military zone of the 27th infantry battalion in Iguala, Guerrero, Mexico, on January 12. Activists and relatives of 43 abducted trainee teachers from Ayotzinapa's teacher-training college broke into the zone, less than a mile from where the students went missing, in an attempt to look for them. The remains of only one of the 43 students has been identified so far.