There are a huge number of caves in Slovenia. In fact, you can find two of the most amazing caves in the world here - Postojna Cave and Skocjan Caves. So close to each other, but so different. I've visited both!
45 minutes north of Perth in Western Australia is Yanchep National Park, an important wetland area for the area's birds and with several limestone caves with unique wildlife. We have visited the Crystal Cave and hiked around Loch McNess.
Carlsbad Caverns are some of the world's largest limestone caves. Wander down into a fairytale landscape of stalagmites and stalactites - and a few hundred thousand bats.
The dark red termite mounds along our path get bigger and bigger the further from the coast we go. Just when I think we've reached the end of the world, we suddenly pass a house. Someone lives out here. Far from everything. We are heading towards the lava tunnels of Undara National Park, in the northern Queensland outback.
