A young Syrian boy cries as his father carries him up a steep hill as they walk to a border crossing on the Greek and Macedonian border September 3, 2015 near Idomeni, Greece. From Idomeni migrants continue north into Macedonia. Since the beginning of 2015 the number of migrants using the so-called 'Balkans route' has exploded with migrants arriving in Greece from Turkey and then travelling on through Macedonia and Serbia before entering the EU via Hungary. The number of people leaving their homes in war torn countries such as Syria, marks the largest migration of people since World War II. (Photo by Win McNamee/Getty Images)Win McNamee / Getty Images
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