The extremist group has destroyed shrines, churches and precious manuscripts in Mosul, Tikrit and other areas of Iraq it controls and excavated sites to sell objects abroad, in what UNESCO chief Irina Bokova described as "cultural cleansing".
In July, for instance, IS rigged the Nabi Yunus shrine in the northern city of Mosul - revered by both Muslims and Christians as the tomb of Prophet Jonah - with explosives and blew it up.
"There were explosions that destroyed buildings dating back to the Assyrian era," Baghdad museum director Qais Rashid said according to a translation from Arabic into English, referring to the once powerful, ancient empire.
"Assyrian tablets were stolen and were suddenly found in European cities," he added, warning that the sale of such artefacts was being used to "finance terrorism".
"There are international mafias... That inform Daesh of what can be sold," he said, referring to an alternative name for IS.
Iraqi authorities have yet to put together a detailed list of what exactly has been destroyed or looted, but Rashid gave a few examples of recent incidents.
"The Mosul museum, the second most important in Iraq, suffered an attack from Daesh and they also attacked the staff from the museum," he said.
In another incident, "Daesh gathered over 1,500 manuscripts from convents and other holy places and burnt all of them in the middle of the city square," he added.
