John Howard Griffin wrote the book Black Like Me in 1959. I read it for the first time about 20 years ago and never forgot it. Well, I read it again this summer and was moved once again. Back then, the author changed his skin color, and now as a black person, he ventured through several racially segregated southern states so that he could experience just what a black person experienced in life.
Click on the title above to get a further insight via Wikipedia; then you can check out the trailer of the 1964 movie below.