Although I enjoy watching non-fiction (and CPL has a great selection from which to choose), I always seem to get side tracked by all the feature films I want to recommend. So let me correct this right now and point you at four titles definitely worth a look.
The Crusades---they began as a holy mission to liberate Jerusalem and became the largest mass migration in European history. When they ended 200 years later, the Crusades had created a mythology of knights and chivalry, and left a legacy of distrust between East and West that continues to shape our world today. Filmed on location throughout Europe and the Middle East. By Terry Jones of Monty Pythons fame with none of the silliness of The search for the Holy Grail.
Babies---this is a real charmer which the whole family can watch and enjoy. A look at one year in the life of four babies from around the world--- Mongolia, Namibia, San Francisco and Tokyo and the culture and nurturing that informs their lives.
How many people can live on planet earth- the always highly informative Sir David Attenborough presents this look at the growth of the world's population and the future of the earth with a population that is projected to grow to 9 billion within the next 40 years. Researchers study densely populated regions to try to understand the problems of overpopulation.
The Medici, godfathers of the renaissance---(not to be confused with The Borgias which is currently running on tv), this is an excellent look at this powerful family and the influence they had over the course of western civilization.