Thank you for your kind words!
Germany is indeed a very beautiful country. I love it. A few years ago I met a Belgium couple on holidays and they said they'd been going to Germany for holidays for about 20 years. They said "here, you have everything, from the alps to the sea, just a few hundred kilometers, we never would want to go anywhere else".
The cave from my pictures is stunning. It is huge! If you ever get the chance to visit it, I am sure you would like it.