Director: Asif Kapadia
What it teaches you: Anything is possible, if you commit yourself fully.
If you come away from this list and decide to watch only one of these documentaries, make it this one. Senna chronicles the meteoric rise of Formula 1's Ayrton Senna, whom many will attest was the greatest driver to ever grace a grand prix circuit. The footage is breathtaking. The story will break your heart. If you consider yourself a racing fan, you must see this doc. It is undoubtedly one of the greatest documentaries of the past 10 years.