The Best Book(s) Thread

Out of all the books you have read, which ones do you feel had the most impact or really resonated with you?

When I was a child, I lived on my bicycle or in the library. I loved to just dive head first into a book and just read for the sake of reading. I haven't read as much as I would have liked to in recent years, but have been trying to devote more time to just read lately. I think it is important in this fast paced world to slow down sometimes and gain knowledge or perspective the old fashioned way.

A few that I couldn't put down...

Inspirational:
Greatest Salesman in the World

Fiction:
The Great Gatsby

Non-fiction:
Touching the Void