A Syrian refugee prays after arriving on the shores of the Greek island of Lesbos aboard an inflatable dinghy on Sept. 7, 2015. Photo credit: ANGELOS TZORTZINIS/AFP/Getty Images
Syrians sleep on the floor of a train car as they travel from Macedonia to the Serbian border on Aug. 30, 2015. Photo credit: ARIS MESSINIS/AFP/Getty Images
Syrians march along a Turkish highway toward Greece on Sept. 18, 2015. Photo credit: BULENT KILIC/AFP/Getty Images
A Syrian child is lifted over a Turkish border fence on June 14, 2015. Photo credit: BULENT KILIC/AFP/Getty Images.
Islamic State fighters prevent Syrians from fleeing the town of Tell Abyad on June 13, 2015. Photo credit: BULENT KILIC/AFP/Getty Images.
A Syrian father and son, their faces smeared with toothpaste as a salve against tear gas, attend a protest to reopen the border with Macedonia in Idomeni, Greece, on April 10, 2016. Photo credit: BULENT KILIC/AFP/Getty Images.
Syrian refugees run across a road after illegally passing through the Greece-Macedonia border and traversing Macedonian woods on April 23, 2016. Photo credit: JOE KLAMAR/AFP/Getty Images
A Syrian man peers through the window of an abandoned train cabin where he sleeps in Idomeni, a village on the border between Greece and Macedonia, on May 5, 2016. Photo credit: GILI YAARI/NurPhoto/Getty Images
Migrants look out at the Aegean Sea from the Greek island of Lesbos on March 25, 2016. Photo credit: DAN KITWOOD/Getty Images
Macedonian police round up Syrian refugees after they broke through a border fence in Idomeni, Greece, on Aug. 22, 2015. Photo credit: SAKIS MITROLIDIS/AFP/Getty Images
Syrians run away as Turkish soldiers blast them with water cannons at the border crossing near the Syrian town of Tell Abyad on June 13, 2015. Photo credit: BULENT KILIC/AFP/Getty Images
A boat carrying Syrian Kurdish refugees sinks off the Greek island of Lesbos after crossing the Aegean Sea from Turkey on Oct. 30, 2015. Photo credit: ARIS MESSINIS/AFP/Getty Images
Migrants and refugees mainly from Afghanistan and Syria line up at the Greek port of Mytilene to board a ferry to Athens on March 8, 2016. Photo credit: ALEXANDER KOERNER/Getty Images
A raft carrying Syrian and Iraqi refugees arrives on the island of Lesbos on Oct. 13, 2015. Photo credit: SPENCER PLATT/Getty Images
Syrians from the besieged city of Aleppo gather at the Turkish border crossing of Bab al-Salam on Feb. 6, 2016. Photo credit: BULENT KILIC/AFP/Getty Images
German Chancellor Angela Merkel takes a selfie with a Syrian refugee during a visit to a shelter in Berlin on Sept. 10, 2015. Photo credit: SEAN GALLUP/Getty Images
A refugee warms himself at a bonfire at the Syria-Turkey border crossing of Bab al-Salam on Feb. 6, 2016. Photo credit: BULENT KILIC/AFP/Getty Images
Turkish police barricade a highway to prevent Syrians from passing into Greece on Sept. 18. Photo credit: BULENT KILIC/AFP/Getty Images
A Syrian refugee walks by the sea on Feb. 10, 2016, in Kladesholmen, Sweden. Photo credit: DAVID RAMOS/Getty Images
A migrant sits in a tent at dusk in Idomeni, Greece, on April 5. Photo credit: BULENT KILIC/AFP/Getty Images
Chinese artist Ai Weiwei holds a sheet of plastic over a Syrian pianist as she plays for the first time in weeks at the Idomeni refugee camp on March 12, 2016. Photo credit: MATT CARDY/Getty Images
Syrian asylum seekers learn German at a registration center on Aug. 27, 2015, in Ingelheim, Germany. Photo credit: THOMAS LOHNES/Getty Images
Medécins Sans Frontières constructs a camp in Grande-Synthe, France, on Feb. 28, 2016, to shelter 2,000 Kurds, Iraqis, and Syrians. Photo credit: PHILIPPE HUGUEN/AFP/Getty Images
A 13-year-old Syrian who lost his left leg during while fighting in Syria uses a frame to support himself as he learns to walk on a prosthetic leg on March 24, 2015, in Reyhanli, Turkey. Photo credit: CARL COURT/Getty Images
A Syrian family drinks tea outside their rental house in Reyhanli, Turkey, on Oct. 28, 2015. Photo credit: BURAK MILLI/Anadolu Agency/Getty Image