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15 travel destinations being ruined by tourism

By: Bryan Nelson on June 4, 2010, 11:55 a.m.

Photo: Crystian Cruz/Flickr

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Teotihuacan is the most visited archaeological site in Mexico and one of the most important representations of ancient civilization. As a result, the ruins have been trampled on for millennia. Today the site is under increased threat from development. In 2004, Wal-Mart Stores opened a branch there, building a large store within the archaeological zone of the park.