Someone said the Picture of Dorian Gray, which I couldn't agree more. It was an amazing book, a little crazy but all the same.
As others said, To Kill A Mockingbird is a must read. I love it.
Midsummer's Night Dream. Yes, it is Shakespeare but just because it is Shakespeare, doesn't mean it is boring. As a matter of fact, I loved it, and I am not a bit fan at all.
Edgar Allen Poe's short stories and poems. I personally love his writing and find it beautiful.
The Chronicles of Narnia.