The United States has only 24 UNESCO World Heritage Sites (Last time I checked). China, ile huwa mnaisifu hapa, has 56. Wazungu ndio wamesema hio. Are you happy now? There are certain criteria that a heritage resource has to meet for it to be listed as a UNESCO World Heritage Site. If it is not listed, then a certain reason is behind that. For instance, a site might have been associated with slavery or war in historical times which might disqualify it. Heritage sites are those of outstanding importance to humanity, therefore certain criteria must be met.