If your level is B1/B2, you probably aren't quite ready to read English books in the original unabridged versions. You certainly won't be able to read books written in previous centuries. There will be too much vocabulary that will be unfamiliar to you and many sentence constructions that you will find too complex to understand. Reading anything that has more than 10% unfamiliar language will be a frustrating and demotivating experience. You'll learn very little from a book which is above your level. I recommend that you read a book aimed at students. All the main publishers of English language textbooks - for example, Cambridge University Press, Oxford University Press, Longman - have simplified books known as 'graded readers.' Many of these are famous works of fiction, both modern and classic - adventure stories, love stories and so on - rewritten by professional writers and teachers. These books are organised according to level, and they have explanations of the more difficult words to help you understand the stories and expand your vocabulary.

You seem to like classics. Me too! Regrettably, English speakers don't speak quite the same way anymore as they do in classic literature:) But you may want to check out the authors Louisa May Alcott and Jane Austen. Alcott is easier. They were both fantastic writers and wrote many books. I'd suggest that you either start with Eight Cousins or Little Women by Alcott and Pride and Prejudice by Austen. You can usually download them for free from iBooks or Amazon. If you want more contemporary classics check out Scott O'Dell and Geoffrey Trease, if you're into historical fiction. Gloria Whelan's also excellent. Happy reading!