'The Hiding Place' by Corrie TenBoom made an impression upon me.
I've been wanting to read this book, 'And Still We Rise: The Trials and Triumphs of 12 Gifted Inner-City High School Students' by Miles Corwin.
One from my high school days, 'Black Like Me' by John Howard Griffin.
Three books about a cat by Cleveland Amory.
Gary Paulsen has written a number of nonfiction and they seem to be as interesting as his fiction.