Mexico's cave of crystals is a geological wonder of the world. A happy accident, really. Naica Cave may close when the people who own the mine run out of money. A must visit. Check out Professor Iain Stewart's new BBC series How the Earth Made Us: The epic story of how geology, geography and climate have influenced mankind on 19 January, 2010, on BBC Two.
Useful link:
www.plymouth.ac.uk/PlanetEarth
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