I don't read much fiction, but here are some I liked:
Gorky Park - Martin Cruz Smith (I enjoyed it, Cold War era, plot twists I think)
Guns of Navarone - Alistair MacLean (WWII era, good characters)
Force 10 from Navarone - Alistair MacLean
^^ A movie was made of both books.
Animal Farm - I felt sad for the horses.
Lord of the Rings - I read them before watching the movies, I enjoyed reading them and felt they were better than the movies immediately after I saw the movies. They have a lot of detail in the books. However I wouldn't read them after seeing the movies, because it is a lot more time-consuming reading them when you know what happens than watching the movies.
Non-fiction:
Courier from Warsaw - Jan Nowak (About the underground army in Poland in WW2, I think its non-fiction, although some names are changed I think.)
The Bible: I've read it once, but I would like to read it again soon. It takes me longer to read it than most books though.