Possession is one the most popular suggestions in the comments! I’m currently listening to it, which is great because it stops you from skipping the poetry. And this book could definitely do with footnotes (and tangents).
I read POSSESSION a really long time ago (1990s!) and it is one of my favourite novels ever (though as someone else said, I skimmed the poetry). I don't usually re-read novels but I think I would re-read that one. And maybe in a slow read I would actually read the poetry too!