Although the famous caves of Nerja also have a fixed epithet, in this case it's justified. The caves are famous, and so they should be — they're spectacular!
The public are allowed into one of three huge chambers, the others being closed for scientific study (they contain some neolithic art and weren't discovered until the 1960s).
I'm a big fan of caves. This one puts the one at Wookey Hollow to shame, and is much, much larger thaan the Cave of Zeus in Crete. It's even more impressive than the Batu Cave in Malaysia, although that one does have a far better entrance. I think the Jenolan Cave in Australia, which I visited some 20 years ago, perhaps shades it, but in terms of impact, it would be churlish not to recognise that the famous Nerja caves aren't prettey damned good.
The first cave was discovered in 1959 when a group of boys (who are still alive, albeit no longer boys) climbed into an opening that bats used to fly out of, to see if they could find where the bats lived. They didn't, but they did find a cave and the bones of a man who had died 20,000 years earlier,
We got to see what the two later caves looked like, courtesy of a VR experience. When it comes to VR, it takes a lot to impress video-game developers; nevertheless, we were impressed. Whoever had made it had done a very good job. Half of us (I was one) had steamed-up lenses on our headsets, though, which detracted from the experience a little, As for why we had steamed-up lenses, well we were told it was cold in the caves and we should wear jackets or extra layers. It was not colds in the caves. It was like an oven. As a result, we emerged hot and sweaty, which for some of us caused our goggles to steam up.
All in all, the famous caves of Nerja were well worth a visit. I'd definitely go again, although perhaps not while wearing a jacket.