>> This is what's left of Mosul Museum, once home to a priceless collection, much of it nearly 3,000 years old. But now it's a monument itself to Islamic State's brutal destruction.>>

It was not something they attempted to hide. Posting videos of the destruction online, shortly taking the city in 2015.

The artifacts they said were images of idolatry and should therefore be destroyed. But it's now emerged not all of them were, only the ones too heavy to move.>>

> This Iraqi officer explains how many of the smaller items looted were kept by the group as a potential source of income.

While the museum has now been liberated, fighting still rages nearby.

ere may not be much left of Mosul, but it's a battle both sides are desperate to win.