The museum ticket is absolutely worth it (15€) I’d say it is even really cheap. The most crowded place in the museum is, of course, the chamber with the portrait of a woman. But don’t look at it, it’s not really interesting, just turn 180 degrees and you will see a real masterpiece which is so underrated being placed near the portrait. And make sure that you learn the history of this place! It is really long, starting from the 11th century!
For me, the most adorable thing about this place was about geometry. Rectangle gardens surrounding the triangle, a perfect symmetry!
It’s not so hard to guess the place, feel free to write your suggestions in the comment section!