John Christopher Tripods Trilogy (The Sword and the Spirit Trilogy is very good too).
Edgar Rice Burroughs The Land that Time Forgot Series.
Hunger Games (the first book).
Harry Potter.
Lots of Arthur C. Clarke (City and the Stars, Childhood's End, Rama, and the collected short stories)
Issac Asimov Foundation and Robot Series.
I like Sci-fi
Edit: Also Hitchhiker's Guide to the Galaxy and The Hobbit.