Graham Hancock's "Quest for the Lost Civilization" - about the astronomical, geographical and mathematical relationships between ancient Egypt, Cambodia, Easter Island etc. Very interesting! "Before Babel – In Search of the First Language" - an attempt to piece together the world's first language. "How To Grow A Planet" is pretty good too! The domination of nature on earth!
I've probably seen around 1000 documentaries to date but here's my top list Al Capone Scarface Philosophy: Guide to Happiness Living with Michael Jackson Zeitgeist: The Movie Stephen Fry: The Secret Life of The Manic-Depressive Why Beauty Matters Fast Food, Fat Profits: Obesity in America The Most Extreme Animals Ancient Ink: Blood and Tattoos Inside LSD Enjoy
The Yogis of Tibet http://www.insightstate.com/tibet/yogis-tibet-film-posterity/ The Message of the Tibetans http://www.insightstate.com/tibet/the-message-of-the-tibetans-buddhism-part-1/ Inner Worlds, Outer Worlds http://www.insightstate.com/video/inner-worlds-outer-worlds-part-1-akasha/ The Man Who Planted Trees http://www.insightstate.com/video/man-planted-trees/
https://www.youtube.com/watch?v=FwAj3qTPt4E World Toilet Crisis https://www.youtube.com/watch?v=U6jmGSS955g BBC ~ Tim Leary Doc
Mr. Death: The Rise and Fall of Fred A. Leuchter, Jr. Documentary filmmaker Errol Morris investigates the case of a man who became an authority on capital punishment, but was discredited when he got involved on the wrong side of a court case. -Rotten Tomatoes Two thumbs way up!
Tales of the Rat Fink (2006) The life and times of famed hot rod & custom car designer Ed "Big Daddy" Roth. It's entertaining, upbeat and transformative. Rough patches in the subjects life are left out and the focus is kept on the subject of cars as Art.
I even have my documentaries divided... Bios (and even sub-categories within those), but here's a few social ones I like -Place de la Republique -Seven-Up (series of documentaries) -Salesman -Chronicles of a Summer