Books are one of the most lucrative collectibles, as auction houses across the globe deal with rare and expensive books that can earn millions. However, first editions always fetch the highest, eye-popping prices.

For example, the world of comic books follows a similar trend, with numerous collectors actively seeking rare comic books and willing to pay substantial amounts for them.

Here are 16 of the most expensive first edition books that have sold—and continue to sell—for a pretty penny.