The WMF (World Monuments Fund) is becoming increasingly concerned about the damage that unsustainable tourism and urban growth are doing to many of the world's monuments. The Nazca lines are under threat because there is no policy on sustainable growth of tourism, while towns like Charleston in South Carolina are becoming overcrowded by cruise ships.
http://www.bbc.com/travel/blog/20111006-an-increase-of-urban-areas-on-watch
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