When Mosul was overrun by ISIS fighters in 2014, the group used it as its seat of power for three years.
The city, situated on the west bank of the Tigris, was left in ruins during the occupation, a situation caused both by the group's own destruction of buildings and artefacts, and the ensuing battles by government forces to wrestle the area back.
Nearly two million Iraqis are still displaced by the fight against ISIS, according to a survey by REACH, a non-governmental organisation.
Many say they are not ready to go home because of the destruction and lack of services.
