I shot this one while i traveled Australia with my girlfriend in a camper van for 3 month (east coast).
If you have the chance to visit natural bridge, you should. Not only is the waterfall in the cave amazing and the light shines trough the hole created by the river above, but the cave also glows at night with glowing worms (this is, if you are there before all the tourist arrive).
I processed the photo in Lightroom, with minimal editing.
For the photo i used a K30 and my lovely 12-24mm from Pentax attached with a ND-Filter to get a 30sec exposure.
Thanks for your time and have a wonderful day