This one photo shows just how massive Europe's migrant crisis is

For months, Europe has been dealing with a massive influx of migrants from Africa and the Middle East. Thousands have made the dangerous, often fatal journey across land and sea, fleeing the violence and poverty of their countries and hoping for asylum in Europe. Last week, Hungary closed its border with Croatia, meaning migrants headed there had to route through neighboring Slovenia instead. But Slovenia announced it would accept only 2,500 migrants per day -- half of what Croatia has requested...