A classic sci-fi (although I think he classified it as fantasy) novel, The Martian Chronicles, is one that has always been on my list but never rose to the top. I learned it was a collection of short stories that were turned into something more of a novel after being put into something of a chronological order.
The book was good, not as great as I think people make it out to be. I had to remember the context of when it was written to appreciate it because otherwise some of the novelty is lost with time. I like Ray Bradbury of what little I have read, so I am happy I finally got around to this his first novel.