1 of 2 Aleppo's Umayyad mosque, photographed before the war, on March 12, 2009 #

2 of 2 Aleppo's Umayyad mosque, after it was damaged, on December 13, 2016 #

1 of 2 Hamam El Nahasin, a historic public bath in the Old City of Aleppo, before the war, on October 6, 2010 #

2 of 2 The interior of Hamam El Nahasin on December 17, 2016 #

1 of 2 Aleppo's historic citadel, before the war, on August 9, 2010 #

2 of 2 Aleppo's historic citadel, after it was damaged, on December 13, 2016 #

A combination picture shows Aleppo's Umayyad mosque, before the war, on March 12, 2009 (top) and after it was damaged, on December 13, 2016 (bottom). #

1 of 2 The entrance to al-Zarab souk in the Old city of Aleppo, before the war, on November 24, 2008 #

2 of 2 The entrance to al-Zarab souk in the Old city of Aleppo, on December 13, 2016 #

1 of 2 The Old City of Aleppo, before the war, on November 24, 2008 #

2 of 2 An overview of the war-damaged Old City of Aleppo on December 13, 2016 #

On October 6, 2010, visitors walk inside Aleppo's Umayyad mosque. #

People walk inside the Khan al-Shounah market, in the Old City of Aleppo, Syria, on December 11, 2009. #

Aleppo at night, on September 5, 2010 #

Costa Coffee and Second Cup coffee branches inside the Shahba Mall in Aleppo, Syria, on December 12, 2009 #

A man crosses a street in Aleppo on December 12, 2009. #

A view of Aleppo from the city's citadel on October 7, 2007 #

Aleppo's Bab al-Faraj Clock Tower, photographed on August 20, 2007 #

People browse inside the Aleppo Souk, the largest covered market in the world, with an approximate length of 13 kilometers, on January 5, 2011 in northern Syria. #

A vendor sits inside an antique shop in al-Jdeideh neighborhood, in the Old City of Aleppo, on December 12, 2009. #

A street scene in Aleppo, one of the oldest cities in the world, on April 2, 2011 #