Books by Jane Austen (such as Pride and Prejudice), Jane Eyre, Wuthering Heights, The Age of Innocence, Romeo and Juliet, María (by Jorge Isaacs), Ana Karenina...
There are so many books you can read, but you know, some people consider historical romance novels (from 80s, 90s) as classics too so you could try those if perhaps you just want romance
Also, think about classic movies, is incredible the amount of films based on classic romance books: those I mentioned before (I don't know if there's a film based on Maria), The Great Gatsby, Gone with the Windd, A Room with a view...
Hopefully it will help you
