Unbroken, Laura Hillenbrand. If you haven't read the book don't judge it by the (awful) movie.
The Liberators: My Life in the Soviet Army. Really opens your eyes to the problems and realities of communism. I love the author's dry sense of humor as he witnesses the absurdity of many of the things he encountered.
Sniper on the Eastern Front, Albrecht Wacker. A view of WWII through the eyes of a German sniper.
Auschwitz: A Doctor's Eyewitness Account, Miklos Nyiszli. A view of the holocaust through the eyes of a Jewish doctor in the Auschwitz concentration camp.