Lord of the Rings, The Hobbit, Narnia, Tom Sawyer, Huckleberry Finn, The Da Vinci Code, The Catcher in the Rye, To Kill a Mockingbird, 1984, War & Peace, Gone with the Wind, Animal Farm, Dune, The Bible.

I don’t think it’s really fair to compare them. Harry Potter was doing this during a time when reading had become a niche community. Those books were doing it when it was the popular medium for storytelling. I mean, I’d take a good book over a good movie, but I don’t think I’m in the majority.

In the 21st century, I can’t think of any. In all of history, many have had more impact. They did not have the competition of television or film though. (Some may have existed at the same time, but those forms of media were not as prevalent as they are now.)