Buddhist monks recover a statue of a Buddhist deity from a monastery at Swayambhunath. Niranjan Shrestha/AP hide caption

itoggle caption Niranjan Shrestha/AP

Dura Europos, a Roman walled city in eastern Syria, dates back to 330 B.C. The main gate is shown here in a photo from 2010. It's one of the many important archaeological sites militants of the self-styled Islamic State have ransacked and damaged. EPA /Deir Ezz-Zour Antiquities Department/Landov hide caption

itoggle caption EPA /Deir Ezz-Zour Antiquities Department/Landov

Syrian volunteers cover mosaics in the Ma'arra museum with a protective layer of glue, covered by cloth. Ma'arra Museum Project/Safeguarding the Heritage of Syria and Iraq Project hide caption

itoggle caption Ma'arra Museum Project/Safeguarding the Heritage of Syria and Iraq Project