Thank you for this travel tip @czechglobalhosts! I didn't know about this place but it reminds me of Saxon Switzerland, where I've been some years ago! I think, next time I should cross the border from there and also take a look at Pravcicka Brana. It's a pity that it's not allowed to access the top of the arch anymore, but well; I also don't wanna be the one on the arch when it crashes...;-)