MOSUL, IRAQ - FEBRUARY 23: Two men walk through destroyed houses in the old city of Mosul on February 28, 2021 in Mosul, Iraq. More than four years after the battle to reclaim Mosul from the Islamic State, groups of Christians and Muslims are working together to restore many religious sites across the city. The old city of Mosul, home to historic mosques and churches was devastated during fighting and much of the city still lies in ruins, however the city is working to clean and restore the sites and prepare the city for the much-anticipated visit of Pope Francis to Iraq in March.  (Photo by Hawre Khalid/Getty Images)