Why does UNESCO describe World Heritage sites as having outstanding universal value?

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UNESCO designates locations as having "outstanding universal value" under the Convention Concerning the Protection of the World Cultural and Natural Heritage, which was adopted in 1972.12

This designation signifies that these sites—which include historic buildings, archaeological sites, and significant natural areas—possess a cultural or natural importance so exceptional that it transcends national boundaries and is of common importance for present and future generations of all humanity. By identifying these sites, UNESCO establishes a framework for international cooperation to ensure their preservation and protection as shared global treasures.12