I've read Mary Shelley's Frankenstein last year and I'm reading it again now. It instantly climbed up to my top 10 book list for Shelley's writing style which I find really sophisticated yet very easy to read (I'm not a native english speaker so books can get difficult to decipher sometimes. I'm still trying to finish Moby Dick but Wow I've never had so much trouble with a book before!).
I've seen several movie adaptations and of course none were as good as the book, but some were surprisingly entertaining. The one I liked the least was the 2014 "I, Frankenstein" and the one I liked the most was the 1935 "Bride of Frankenstein" which I