This is a sinkhole called The Devils Coach House at the Jenolan Caves, a place I used to frequent, and climb down into.
A side of the sinkhole is now accessible by a path into the bottom of the hole, but I always preferred to do it the rope way...hee hee.





This is another sinkhole nearby called Elders Cave, it's a lot of fun to.





This one is my favourite cave, the Wyanbene Caves.
The entrance sinkhole is some 30 feet deep.



At the bottom of the sinkhole you have a crawl about 20 feet long with your head just above the water.



And then when you in.....it's fun time