Young Adult isn't really just for the 12-18 age group anymore—it's the fastest growing publication category right now. In fact, 55 percent of readers who buy YA are actually over 18. If you still feel guilty picking up Harry Potter, don't.

The classification of "Young Adult" turns a lot of "mature" readers away from classics that demand extra attention, especially once you're a proper adult. You might've skipped these because they weren't on your required reading list, or maybe you just Sparknotes'd your way through high school— either way here's an unranked collection of the Best Young Adult Fiction Novels of All Time.

RELATED: 50 Books to Read Before You Die
RELATED: The 10 Most Unintentionally Terrifying Children's Books
RELATED: 25 Books That Will Make You A Better Person 
RELATED: 25 Novels That Should Have Movie Adaptations