I want to hear about your unknown favorites!

Hey y'all! I'm finishing up a work (academic) project, and, to my delight in the near future I will have time to read for fun again! In talking with a friend, I realized that many people have at least one or two favorite books no one's ever heard of before.

Fiction, nonfiction, weird, old, whatever! What're your favorites?

I'll start: Karl Kerenyi's book on Hermes, and Ex Libris, by Anne Fadiman. The Kerenyi text is lovely because he dwells in this between-place of pure academic and personal experience, and it reads almost like a memoir of a man who is still very much in the midst of his love affair with his research. The Fadiman book is a lovely (if tiny!) volume of essays that I've come back to time and time again about what books mean to a reader, and how they have shaped her life.