In North Africa, on the border of Morocco, there's a Spanish town called Melilla. It's technically Europe. So undocumented migrants and refugees, asylum seekers, wait in limbo for a chance to scale the fence and apply for asylum in Europe. It's the first of many, many hurdles. And it's a tall one.

This video from Vox takes you to Europe's most fortified border. Check out the full Vox Borders videos series here.