Video: Kids in war-torn Syria shelter in caves
After two years of conflict in Syria, the United Nations says nearly 70,000 people have died and hundreds of thousands more have been forced to flee from their homes.
Many have left Syria, in the Middle East, to escape fighting and try to find safety in refugee camps in neighbouring countries.
But those who stay behind are often trapped in terrible living conditions - with some kids even forced to live underground to escape the fighting.
Nel's been looking at what life is like for some of these children....