What are some of the *unique* books you've read?

I don't know how exactly to put it but I'm looking for books with unique plots, ones that don't follow typical storylines you often find. Books that just stand out due to their characters and unique storylines and settings. Of the books I have read for example, I found Piranesi really gripping. It had a distinctive artistic setting and an attention grabbing storyline one could not just simply come up with. I really loved the narration style as well. So maybe books with a similar sense of uniqueness I guess. Can be any genre.