BAGHDAD (AP) — For more than 5,000 years, numerous civilizations have left their mark on upper Mesopotamia — from Assyrians and Akkadians to Babylonians and Romans. Their ancient, buried cities, palaces and temples packed with monumental art are scattered across what is now northern Iraq and eastern Syria.

Now much of that archaeological wealth is under the control of extremists from the Islamic State group. The militants have demolished some artifacts in their zealotry to uproot what they see as heresy, but they are also profiting from it, hacking relics off palace walls or digging them out to sell on the international black market.