The cave is the start of an underground cavern system which goes through a series of passages, drops and streams where a river changed its course to go underground, reappearing in the next valley.
This can be walked (take the right gear and a good torch), and since it is only about 340 metres in length is not so daunting a prospect for the amateur spi...spi... oh damn, potholer! Watch out for sudden changes in water level.
I liked this as it was a challenge in terms of dynamic range as well as the clouds scudding across the outside changed everything (thanks Pat).
This is part of the country featured in the Lord of the Rings trilogy.
Australia - New Zealand / New Zealand
Lat: 44° 12' 46.81" S
Long: 171° 44' 32.28" E
Precision is: Unknown / Undeclared.
Photomatix, Photoshop, PTGui, Sweat (work it out)