The War You Don't See
Society/war. Trust your TV. Maybe.
NG: Ground Warfare
Military/engineering. 4 parts: Guns, tanks, fortresses and arty. All awesome.
BBC Horizon: Is Everything We Know About The Universe Wrong?
Science/astronomy. Horizon is legendary. This one is one of the best.
The Fog of War: Eleven Lessons from the Life of Robert S. McNamara
Politics/philosophy. I don't agree with all of his though but they are none the less without reason.
Society/environment. Makes you think.
The Revelation of the Pyramids
Conspiracy/history. Pyramids. A bit cheesy but interesting. Special recommendation for Stargate fans.