In this Nov. 18, 2017 photo, construction workers carry a generator as a bulldozer remove debris from destroyed shops in the Old City of Mosul, Iraq. Along the neighborhood's gutted roads, a handful of people are beginning to rebuild but the task ahead will take years _ and billions of dollars. (AP Photo/Felipe Dana)
By: Felipe Dana
In this Nov. 15, 2017 photo, Ahmed Maha sits with his face covered in dirty after a day of work removing debris from a shop in the Old City of Mosul, Iraq. Lacking enough funds from the government or international community, Iraqis have begun to rebuild on their own, dipping into savings and borrowing from friends and family. (AP Photo/Felipe Dana)
By: Felipe Dana
In this Nov. 14, 2017 photo, a construction worker climb the stairs of a destroyed shop in the Old City of Mosul, Iraq. The scope of destruction in the neighborhood is comparable to some of the worst urban battles of World War II, and the cost of rebuilding is nearly incalculable. (AP Photo/Felipe Dana)
By: Felipe Dana
In this Nov. 16, 2017 photo, a boy who recently returned to the Old City walks past a destroyed building near his house in Mosul, Iraq. The U.N. estimates around 40,000 homes will need to be rebuilt or restored in Mosul, which faces the longest path to rebuilding of all the Iraqi cities freed from the Islamic State group. (AP Photo/Felipe Dana)
By: Felipe Dana
In this Nov. 16, 2017 photo, Mustafa Hansen, left, helps his father Ahmed Mohammed, center, and his grandfather Mohammed Tahar, clear the alley leading to their house in the Old City of Mosul, Iraq. Lacking enough funds from the government or international community, Iraqis have begun to rebuild on their own, dipping into savings and borrowing from friends and family. (AP Photo/Felipe Dana)
By: Felipe Dana
In this Nov. 15, 2017 photo, aerial view of destroyed building and shops in the Old City of Mosul, Iraq. The scope of destruction in the neighborhood is comparable to some of the worst urban battles of World War II, and the cost of rebuilding is nearly incalculable. (AP Photo/Felipe Dana)
By: Felipe Dana
In this Nov. 18, 2017 photo, a construction worker walks amid a cloud of dust as a bulldozer remove debris from destroyed shops in the Old City of Mosul, Iraq. The cost to rebuild after driving out the Islamic State group will be enormous. Baghdad estimates $100 billion is needed nationwide _ while local leaders in Mosul, the group's largest urban stronghold, say that same amount is what's needed in their city alone. (AP Photo/Felipe Dana)
By: Felipe Dana
This satellite image released by DigitalGlobe shows what remains of the al-Nuri Mosque in Mosul, Iraq on July 8, 2017. Three years of war devastated much of northern and western Iraq. Baghdad estimates $100 billion is needed nationwide to rebuild. Local leaders in Mosul, the biggest city held by IS, say that amount is needed to rehabilitate their city alone. (DigitalGlobe via AP)
COMBO - This combination of two satellite image released by DigitalGlobe shows the al-Nuri Mosque in Mosul, Iraq on July 8, 2017 after a punishing nine month battle to oust Islamic State militants, left, and on Nov. 13, 2015, right. Three years of war devastated much of northern and western Iraq. Baghdad estimates $100 billion is needed nationwide to rebuild. Local leaders in Mosul, the biggest city held by IS, say that amount is needed to rehabilitate their city alone. (DigitalGlobe via AP)
This satellite image released by DigitalGlobe shows the Old City of Mosul, Iraq on July 8, 2017 after a punishing nine month battle to oust Islamic State militants. Three years of war devastated much of northern and western Iraq. Baghdad estimates $100 billion is needed nationwide to rebuild. Local leaders in Mosul, the biggest city held by IS, say that amount is needed to rehabilitate their city alone. (DigitalGlobe via AP)