On August 18 2015, Khaled Al-As’ad, the former director of antiquities and museums in Palmyra, Syria, was murdered by Daesh for trying to protect the ancient city’s cultural heritage. Eighty-three years old, he had dedicated his life to the preservation of one of the world’s most important archaeological sites. Publicly beheaded for refusing to reveal the location of artifacts he had helped to hide, Khaled al-As’ad’s execution shocked and horrified ...