[masraum]

This is actually really old news, at least a year old. All of the pics are real except for the last which looks like it's out of a video game. This is also not the only cave with these types of crystals in the world. There's another set in Chile and some in Spain IIRC.

Here's another link, but if you do a search for naica cave or naice crystals you'll find more info.
http://giantcrystals.strahlen.org/america/naica.htm