My favourite documentary of all time
Why We Fight.
And probably the best documentary of all time, The World At War.
26 part WW2 documentary, made in the 70's, narrated by Lawrence Olivier with interviews with figures such as Hitler's secretary, Curtis LeMay, Admiral Donitz and Albert Speer.
Episode 1.
The theme song gives me chills every time. One of the earliest memories in my life is my great grandmother having this on TV in the early 80s and that theme song was burned into my memory.