The Sun Also Rises

A classic tale of finding yourself and of living life to the fullest - which, in Hemingway's eyes, seemingly consists of bumming around Europe and getting drunk a lot. This will surprise no one who's familiar with Hemingway's life.

That being said, it's a lot more readable than a lot of the “classics” of literature from the same era, and does a good job of capturing the zeitgeist of postwar Europe, I think.