I went to Malta in January, there are two "show" caves in Gozo, Xerris cave and Ninus cave.
I went to one, don't remember which, but it was extremely disappointing.
Both are located under private houses and contain well decorated chambers, and the one I visited had walkways hacked unsympathetically through the formations.
Whichever one I visited, the owners knowledge was that some of the formations looked like crocodiles, some looked like ducks, and that one over there looks like a penis.
Looking at google pictures, I think I visited Xerris cave.