The popularity of this fantasy book has exploded over the last several years, so what list wouldn't include A Game of Thrones as one of the greatest fantasy series? If you like multiple, intricate story lines, a cast of characters where none is safe from death, and a world full of lords, knights, bastards, wizards, ladies, and more, then you'll like this series. It has magic, intrigue, mystery, and lots of romance; in essence, a world unlike any you've ever encountered. While the movie adaptation has sparked several conversation, the series itself is no doubt one of our picks for top fantasy books.