Watchmen:Alan Moore. An alternate 1985 where the USSR and USA are on the brink of nuclear war. Masked adventurers have become quite common in society until a law bans the masked heroes. It is a graphic novel but very profound and intelligent. The Plot deals with moral ambiguity, the greater good vs justice, philosophical differences, time, and features characters so real and complex that you feel as if you have spoken to them.
V for Vendetta: Alan Moore. An alternate 1997 (although written in the 80's) It is about a post nuclear war England that had survived by removing American missles from the country. This book, like Watchmen is profound. It deals with anarchy, heroism, culture, and has a healthy dosage of philosophy related sub plots. These two books helped change my opinion on Graphic novels. The addition of pictures does not make the book less intelligent by any means. These two graphic novels are shining examples.
Atlas Shrugged: Ann Rand. I am currently reading through this and so far it is a really good book. It help Rand develop a larger following for her objectivist philosophy and the plot deals with the world moving further and further into socialism (So far) and it does a good job of demonising the enemies of her view while convincing you of her own.