Story highlights Thousands of migrants are in Serbia's capital

Serbian worker says the refugees are "just running from a bad situation"

Europe is facing its largest migrant crisis since World War II

Belgrade, Serbia (CNN) Eighteen-month old Ali runs around happily in his clean new tiger-print pajamas. For the first time in a long time, he is clean -- something that his mother couldn't help him with much until now.

They and many other refugees came from war zones -- many having fled Syria and Iraq. The park in central Belgrade, where they are now, is a welcome resting spot, a place where they can eat, clean up and find shelter.

But it's not home.

Serbia is the latest stop for these people, who arrived by boat on the shores of Greece, traveled through a no man's land border to Macedonia and then headed north. They've been on the road for days, and it's not over yet. Many say they hope to settle down in Western Europe, where economic prospects and inclusion in the European Union gives them a better chance at a new life.

Thousands see this as the best path ahead, creating what's being called Europe's biggest migrant crisis since World War II.

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