A collection of photographs unearthed 4 years ago documenting the observations of Vivian Maier, a nanny working the US during the 1950's have been published and they are simply stunning. Click here to view. http://www.vivianmaier.blogspot.com/
Back story also available here: http://www.guardian.co.uk/artanddesign/2011/jan/16/vivian-maier-chicago-street-photography?intcmp=239