Take a look at this blog: http://vivianmaier.blogspot.com/
Vivian Maier was a nanny in Chicago who took photos that she never showed to anyone. As in, hundreds of thousands of amazing street scenes from the 50's to the 90's. Her photos might never have been discovered if a man named John Maloof hadn't bought her negatives, photos, and rolls of undeveloped film at an auction. It's a crazy story, and the photos are something to write home about.