Google Maps is perhaps one of the most useful services which Google has rolled out; people have used Google Maps as the basis for all sorts of cool and interesting things. One such use is History Pin, a service through which people can upload photos from days of yore and ‘pin’ them onto a Google map of the region, indexed by the represented date. But the really cool thing about HistoryPin is that you can see the photo in context, inserted into the moden day street view.