Mohammad Al Asaad stands next to a portrait of his late father, Khaled Al Asaad, a prominent Syrian archaeologist who was beheaded by ISIS in the ancient city of Palmyra.  Xinhua/Shutterstock
Mohammad Al Asaad stands next to a portrait of his late father, Khaled Al Asaad, a prominent Syrian archaeologist who was beheaded by ISIS in the ancient city of Palmyra.  Xinhua/Shutterstock

Family of archaeologist killed by ISIS vow to recover his remains