I finally had the opportunity to read "Watchmen" by Alan Moore, which is one of the top 100 books.
This is a graphic novel, or a comic book, really, full of evocative art, which makes it an easy read, in theory, but the subject matter is by no means light. This is a series of stories about what humanity is really like, what the world needs, how we see one another (or fail to). Do we need heroes? Who would we be without them?