Some experts are calling it the worst crime against cultural heritage since World War II. After five years of devastating civil war, Syria’s ancient treasures are being plundered by Islamic State militants and sold on the posh private markets of Western Europe. In Explorer “Blood Antiquities” journalist Inigo Gilmore investigates the shady pipeline that winds through the Middle East and into Europe and beyond. What smuggling routes are these looted relics taking? How are they getting through international borders? Who is smuggling them? And who is buying them? And inadvertently funding the Islamic State’s campaign of terror?