This combination of two photographs shows a 1932 image of the Crooked Minaret mosque next to a Yazidi shrine in Mosul, northern Iraq, from the Library of Congress, top, and the same site, without the shrine, on June 8, 2009. In July, Islamic State militants failed to destroy the 840-year old Crooked Minaret that leans like Italy's Tower of Pisa when residents sat on the ground and linked arms to form a human chain. (Photo by AP Photo)

This combination of two photographs shows a 1932 image of men on a lorry on the road to Mosul, northern Iraq, from the Library of Congress, top, and fighters from the Islamic State group parading in a commandeered Iraqi security forces armored vehicle down a main road in Mosul on Monday, June 23, 2014. A trove of photographs now housed at the Library of Congress offers a glimpse at a different Mosul – before wars, insurgency, sectarian strife and now radicals' rule. The scenes were taken in the autumn of 1932 by staff from the American Colony Photo Department during a visit to Iraq at the end of the British mandate. (Photo by AP Photo)

This combination of two photographs shows a 1932 image taken during the autumn of Nebi Yunis, the tomb of the prophet Jonah, in Mosul, northern Iraq, from the Library of Congress, top, and Iraqis walking in the rubble of the revered Muslim shrine after it was was destroyed on Thursday, July 24, 2014 by militants who overran the city in June and imposed their harsh interpretation of Islamic law. Iraq's second largest city, Mosul, is now locked under the rule of extremists from the Islamic State group trying to purge it of everything they see as contradicting their stark vision of Islam. (Photo by AP Photo)

This combination of two photographs shows a 1932 image of Iraqis in the market in Mosul, northern Iraq, from the Library of Congress, top, and demonstrators chanting pro-Islamic State group slogans as they carry the group's flags in front of the provincial government headquarters in Mosul on Monday, June 16, 2014. A trove of photographs now housed at the Library of Congress, taken in the autumn of 1932, offer a glimpse of Mosul before wars, insurgency, sectarian strife – and now Islamic State militants_ravaged the city. The scenes were captured by staff from the American Colony Photo Department during a visit to Iraq at the end of the British mandate. (Photo by AP Photo)

This combination of two photographs shows a 1932 image of a main street in Mosul, northern Iraq, from the Library of Congress, top, and militants parading down a main road in Mosul, posted on a militant Twitter account on Wednesday, June 11, 2014, which has been authenticated based on its contents and other AP reporting. Iraq's second largest city, Mosul, is now locked under the rule of extremists from the Islamic State group trying to purge it of everything they see as contradicting their stark vision of Islam. (Photo by AP Photo)

This combination of two photographs shows a 1932 image of a lorry on the road south of Mosul, Iraq, from the Library of Congress, top, and an image posted on a militant news Twitter account on Thursday, June 12, 2014 showing militants from the Islamic State group removing part of the soil barrier on the Iraq-Syria borders and moving through it. As the United States and the international community are grappling with how to battle the group that now controls territory stretching from northern Syria to the outskirts of Baghdad, here is a look at scenes from Mosul – in more peaceful times and today under the rule of the Islamic State Group. (Photo by AP Photo)

This combination of two photographs shows a 1932 image of Lady Surrma of the Assyrian community posing for a portrait in Mosul, northern Iraq, from the Library of Congress, left, and an Iraqi woman looking at a shop display in central Mosul after the Islamic State group ordered clothes shop owners to cover the faces of the mannequins on Monday, July 21, 2014. The shop owners said, apparently in line with strict interpretations of Shariah law that forbid statues or artwork depicting the human form. (Photo by AP Photo)

This combination of two photographs shows a 1932 image of Iraqi vendors and customers in the shoe market in Mosul, northern Iraq from the Library of Congress, top, and a Monday, July 7, 2014 file photo of a man walking in a market, nearly a month after Islamic militants took over the country's second largest city. A trove of photographs now housed at the Library of Congress offers a glimpse at a different Mosul – before wars, insurgency, sectarian strife and now radicals' rule. The scenes were taken in the autumn of 1932 by staff from the American Colony Photo Department during a visit to Iraq at the end of the British mandate. (Photo by AP Photo)

This combination of two photographs shows a 1932 image of the Tigris River stretching out in the distance as seen from Mosul, northern Iraq from the Library of Congress, top, and a file photo of smoke rising during airstrikes targeting Islamic State militants at the Mosul Dam on Monday, August 18, 2014. A trove of photographs now housed at the Library of Congress offers a glimpse at a different Mosul – before wars, insurgency, sectarian strife and now radicals' rule. The scenes were taken in the autumn of 1932 by staff from the American Colony Photo Department during a visit to Iraq at the end of the British mandate. (Photo by AP Photo)

This combination of two photographs shows a 1932 image of a coppersmith working in the market in Mosul, northern Iraq, from the Library of Congress, top, and a June 22, 2014 file photo of a fighter with the Islamic State group distributing a copy of the Quran, Islam's holy book, to a driver in central Mosul. As the United States and the international community are grappling with how to battle the militants, who now control territory stretching from northern Syria to the outskirts of Baghdad, here is a look at scenes from Mosul in more peaceful times and today under the rule of the Islamic State group. (Photo by AP Photo)