Revealing the World Heritage cities and their varied natures

Mankind gets impoverished every time cultural and natural heritage gets irreversibly destroyed. World Heritage cities host cultural heritage of "outstanding universal value"; so, the destruction of their cultural heritage brings higher impoverishment than on any other city. Development is not the only threat found endangering WH cities, but is one of their most prominent and rising threats. Though, cities need to keep evolving and no development can strongly compromise their sustainability. Reacting upon the cun'ent lack of an updated list of WH cities, this article proposes a definition and reveals the respective list, distinguished according to their varied natures. These results will allow further research to verify if the nature of WH cities is an influencing factor on their endanger level