Pic of the day: The world's largest cave discovered in Vietnam

Pic of the day: The world's largest cave discovered in Vietnam

The Hang Son Doong cave - named after the Vietnam discoverer - is twice as big as any other discovered cave. It was first discovered in 1991 but not explored until 2009 by a British cave explorer team. Ace of Spades posted on this piece over at National Geographic. This pic puts the scale of the cave in proper perspective:

This one too:

More at the National Geographic link.