Important that you have stopped in your traveler's story in this place and have dedicated yourself to inform us about its historical relevance, @lufcija. I'm not European, but I did have a general knowledge of that agreement, but not of the place, much less of its details.
The monument/sculpture alluding to this important agreement is very striking and symbolic. Although it took me a while to see clearly the last photograph, about which you ask us, I dare say that the star alludes to Greece: by the icon of the Olympics (originally Greek), the Discóbolo (Greek sculpture), as I can detail.
What a beautiful castle! The buildings covered with ivy captivate me (in my region there is such a small church).
Thanks for your post, @lufcija. Greetings.