SEE THE 12 PHOTOS : Harrowing Photos Reveal How Migrant Children Are Forced To Sleep In Forests, Alleys & Gutters Of Europe

Lying cold and frightened in an unfamiliar bed, or sprawled on a filthy mattress while reliving the memories of family members' deaths - these heartbreaking photos show where children fleeing Syria are now forced to sleep.

Since 2011, the war between Syrian president Bashar al-Assad's government and rebel groups including ISIS and the Free Syrian Army has claimed the lives of 200,000 people and created an estimated 4million refugees.

Among them are thousands of children. Many are so young they know nothing but violence, while others hold only fleeting memories of childhoods spent in once-peaceful cities such as Aleppo and Homs. They are quite heartbreaking, more after the cut......