I came across this the other day. Needless to say it's an amazing find to the geological world. A hidden cave that was only discovered a year ago that you can fit a sky scraper into.
Hard to wrap your mind around it.
http://ngm.nationalgeographic.com/2011/01/largest-cave/jenkins-text (http://ngm.nationalgeographic.com/2011/01/largest-cave/jenkins-text)
Now they are amazing photo's :good2:
Amazing isn't it that Man can explore space when he knows so little about his own planet :shok: