Looks amazing, love your pictures! I just wrote about Postojna Cave in Slovenia, which is the most visited cave in Europe, you would probably love it! There is a few I've been to, one is called Skocjan Caves, so there's two big ones to see in Slovenia, if you ever go, I highly recommend them. Unfortunately my pics are not as professional, not having a camera and not allowed to use flash in the cave, prevented better photo taking, but seeing it in person, is such an experience. Thanks for sharing!