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MMM, nope Jaros. Looks like more help is warranted.
The history for this starts many thousand years ago (I'm an oldy, but wweeell before my time), but has really only been brought to the general public attention in the last half of the 20th century. Has some rather spectacular features and is of geological origins.
Magilla has got it again. I had a few more clues that I could have used, but was running out.
If you haven't visited the Undara National Park, then put it on your bucket list.
The Undara lava tubes are the longest known lava flow from a single volcano in the world and the name is based on the aboriginal word Undara meaning "long way". Undara was only made a National Park in 1992 and I first visited there in 1993, but have been back several times since. Good caravan park onsite, access to the caves is only via conducted tours which aren't really cheap, but I have done all that are available and they are great.
Making the question/answer Oz based and reasonably Google "proof", but still being appropriate for this forum and hopefully not too difficult, is a challenge. I am glad that you liked it.
Almost don't want to put this answer up, because if it is not right, it would be the basis of a great question. None the less, is it Black Mountain, Queensland?
Yes it is.
Aboriginal legend says it was formed by two blokes chucking rocks at each other. They must have had a good throwing arm, some of the rocks would weigh over 50 ton. There have been a few go missing there over the years, it is believed they got lost in the many caves. One bloke was a felon being chased by the law, another was the lawman chasing him. A prospector also disappeared there a while back, maybe he found something and is still digging. I first saw Black Mountain in 1985 and it blew me away, something not to be missed if you are up that way.
And Rob, in addition to your observations "Making the question/answer Oz based and reasonably Google "proof", but still being appropriate for this forum and hopefully not too difficult, is a challenge. I am glad that you liked it," the other hard thing is to think of something we have not covered before, given there are more than 5,000 posts in this thread!
Agreed Magilla an impressive site. The access was easier in those earlier days, now the road and parking have been relocated and you are "discouraged" from going too close.
What a lot of people don't realise is that the black colour is just algae, as it can get rather humid up there.