The Adventures of Tintin 

Created by Herge, much like Asterix, Tintin is one of the greatest Gallic graphic novel series ever created for children. Packed with riotous humor and plenty of subtlety, this is a series that takes on a whole new meaning when read as an adult.

Grown ups are more likely to pick up on the additional information provided and connect the dots thanks to the book's depiction of various political crises. When you take all of this into account, it's easy to understand why a mastermind like Steven Spielberg decided to make a movie out of it.