Thousands have been killed and millions made homeless in Syria's civil war. It has also caused irreparable damage to some of the world's most precious historical sites.
"It feels cruel to talk of bricks and mortar while children freeze in unsanitary refugee camps, and yet these sites and treasures matter to everyone on the planet, and they matter particularly to Syrians, who will rely on them as the mainstay of their economy whenever peace is restored."
Historian Dan Snow reflects on the impact of Syria's heritage under attack. http://www.bbc.co.uk/news/magazine-21702546