One of the saddest aspects of studying history is how it is mostly told from a white point of view. Sources, throughout history, were far more likely to be written by white people, and they were more likely to survive. But far more depressing is how history is frequently taught from a white point of view.
There are historians, professional and amateur, whose work is changing this, and the Internet has become a great place for the forgotten, often-untaught histories to find new life. My newest favorite is Of Another Fashion, a blog covering the fashion choices (and the related life issues) of women of color. The tumblr has tons of pictures and personal testimonies as to the sartorial choices of women of color. A recent great post discussed the cultural history of the lunch counter.