A human head carved in an Assyrian marble slab is displayed in a heritage exhibition at the Assyrian hall of National Museum in Baghdad, Iraq, May 19, 2019. The 30-day heritage exhibition kicked off on Sunday in accordance with International Museum Day. (Photo: Xinhua)

People tour a heritage exhibition at the Assyrian hall of National Museum in Baghdad, Iraq, May 19, 2019. The 30-day heritage exhibition kicked off on Sunday in accordance with International Museum Day. (Photo: Xinhua)

Statue of the king Shalmaneser III is displayed in a heritage exhibition at the Assyrian hall of National Museum in Baghdad, Iraq, May 19, 2019. The 30-day heritage exhibition kicked off on Sunday in accordance with International Museum Day. (Photo: Xinhua)

Visitors look at pictures of ancient coins during a heritage exhibition at the Assyrian hall of National Museum in Baghdad, Iraq, May 19, 2019. The 30-day heritage exhibition kicked off on Sunday in accordance with International Museum Day. (Photo: Xinhua)

A visitor looks at a statue of the god of widsom Nabu in a heritage exhibition at the Assyrian hall of National Museum in Baghdad, Iraq, May 19, 2019. The 30-day heritage exhibition kicked off on Sunday in accordance with International Museum Day. (Photo: Xinhua)