A useful CNN report here on 9 places that are being killed by the tourists that are visiting them, because they are being damaged by the sheer numbers of people, or the activities that they are doing.
Can you identify other local tourist honeypots perhaps where there are conflicts developing because of the way that people are using the areas, or disrespecting the local culture (Mt. Kinabalu was in the news recently)
I can think of a few other places, such as the Lascaux caves, which had to be closed off to visitors as their breath was damaging the cave art on the walls and ceilings, and a replica created.
Have you been to any of the places mentioned in the article?
What did you notice while you were there?