The "outstanding universal value" means that these features have significance beyond national borders and are of importance to present-day as well as future generations. World Heritage Sites belong not only to the sovereign states in which they are found, but also to mankind’s global heritage.
Natural Heritage Sites represent unique natural phenomena, whereas cultural Heritage Sites preserve outstanding human achievements. Together, these unique natural landscapes, plant and animal habitats, geological formations, cultural landscapes and cultural treasures form the UNESCO World Heritage list. The most important criteria for admission to the World Heritage list are outstanding universal value, integrity and authenticity, as well as a commitment to protection and management.
Currently, there are 1154 sites in 167 countries on the World Heritage list. Of these, 897 are cultural sites, 218 natural sites and 39 so called „mixed sites”, of both cultural and natural significance. There are 52 sites on the „List of World Heritage in Danger”, including the Rainforests in Madagascar, the Virunga National Park, the Historic Centre of Vienna and the Old City and City Wall of Jerusalem (as of July 2021)