Let's take a little trip, shall we?
This time, let's go to Greece, where we went to see the world's prettiest beach not too long ago.
To get to the cave, you have to take an underground tunnel, where you hop in a boat and check out the crazy clear-blue waters and the stalactites that surround you. It was discovered by Giannis Petrochilos in 1951 and opened to the public in 1963.
But mostly it's just a really pretty color and really cool to look at.