Oh god, where to begin.
The Hobbit. I loved it, far more than the LotR series, I wouldn't even hold them in the same vein.
Interview With a Vampire. Brilliant book, the trilogy is great. The original movie with Pitt and Cruise is also quite good, but that's only because Anne Rice, the author wrote the screenplay. The other adoptions of the books "Queen of the Damned" are absolute shit.
Uglies. I know it's a bit 'teen' but it's a wonderful escape kind of trilogy. The storyline fully absorbs you in the surreal, wacky futuristic world, I recommend it to anyone who has a strong fantasy... it just jumps out of the page for me.
To Kill a Mockingbird. I usually avoid mentioning the typical "BEST BOOKS OF ALL TIME OLLOLOLOL OMG" but I love this to pieces, wonderful story and brilliantly told.
So many more that I love... Clockwork Orange, Lord of the Flies, Clan of the Cave Bears, etc.