UNESCO is the United Nations Educational, Scientific and Cultural Organization. It seeks to build peace through international cooperation in Education, the Sciences and Culture.
Up to the formal information Unesco website provided including a site into World Heritage List helps waking societies and governments awareness (In another word they start to care more about it).
Sites in the list get to be known better so more and more locals and foreigners come to visit them.
Check out the List of World Heritages in Turkey
Sites in the list help to develop their local area, tourism starts to help making some money for locals and provide employment.
They also provides financial help for the sites in the list.
This is the best and most important fund. Besides helping sites in the list it finances Endangered World Heritage Sites List for fixing damage.
In case of any ignorance in protecting listed sites they can remove sites from the list immediately. This encourages people maintain them well enough to keep them in the list.
So far they already have exluded two examples: from Jordan (2007) and Germany (2009).
“Since wars begin in the minds of men and women, it is in the minds of men and women that the defences of peace must be constructed.”