Every international recognition of a single destination brings its amount of local consequences. On one hand, it highlights and promotes the local destination in the global markets and gives new opportunities for local development. On the other hand, standardization of the heritage and local processes, contamination and increase of social inegalities due to the fast and uncontrolled development are at least as frequent as its positive effects. The « World Heritage » denomination by the UNESCO (United Nations for Education, Science and Culture Organization) is one of these international recognitions. My ambition to be a « responsible traveler » was put to a severe test when it was about visiting some of the World heritage sites, of which many are now totally committed to the mass tourism. In another top list posting, I gave my best experiences of World heritages. Here are my worst ones! Let think about that you may also have a bad experience there.