The Popular Mobilization Forces is an Iraqi militia that could hold the key to defeating the Islamic State militant group.

Refugees from Syria are abandoning a country torn apart. Their heart-breaking plight has hit headlines as the crisis deepens. Back where was once home for the refugees, militants are taking sledgehammers to history. Syria's famous archaeological treasures have been preserved for thousands of years. But as civil war rages, cultural heritage sites are being flattened.