Actually, Zeus was born in several caves on Crete, but this is the most photogenic one.
My camera makes it look much more colourful than it does in reality.
Pretty well alone among the Ancient Greeks, the Cretans thought Zeus wasn't immortal. The general sentiment was that Zeus was immortal, hence the phrase "All Cretans are liars". Given that Zeus doesn't seem to be around any more, though, it looks as if the Ancient Cretans were right. The joke's on you, other Ancient Greeks!