Must've been based on Verne's The Carpathian Castle as was the Czech film Tajemstvi hradu v Karpatech [entire film on youtube] from 1981. The latter treats the story quite differently, of course. This offering was enjoyable visually with the Quay's signature complex and layered visuals, chiarosuro, and dramatic sensibilities.

Not for most people, this film is engrossing for some, but ultimately possesses a lopsidedness weighted towards the visual. I like a more rounded film myself, but feel this was worth experiencing.

Updated to add: Some films 'feel' like films and have a satisfying fullness, while others don't feel complete - in the manner of, say, Guy Maddin films (which are annoying in their insistence on placing barriers between me and the content, as though GM wants to hold up a toy but not let me play with it). It's like part of my brain is twiddling its thumbs instead of being absorbed in the unfolding story. Piano Tuner of Earthquakes is that type of film, to me. YMMV but probably not much.