Fighting between Kurdish rebels and Turkish forces damages ancient walls ranked with the Taj Mahal and Egypt's pyramids

When the United Nations inscribed the Roman-era walls of this mainly Kurdish city on its World Heritage List last year, it crowned a decade of efforts to rehabilitate a war-torn region.

Within weeks, a cease-fire with Kurdish militants in southeastern Turkey shattered, unleashing some of the worst fighting in a three-decade conflict and laying waste to swathes of Diyarbakir's ancient district of Sur.