I think that Karl Pilkington's (who is a British renowned travel TV explorer presenter and writer) expose of Machu Picchu is probably the most accurate I've I come across on the main stream TV travel guides.

http://www.youtube.com/watch?v=hzt_iMqz9k8

After visiting Chitchen Itza, I can whole heartly agree with his viewpoint on this Mexican Tourist Iconic historic site.

http://www.youtube.com/watch?v=jLDARFNe1Lc

Thanks for the Link.