You're standing at the bottom of George Street in Halifax, Nova Scotia, looking up towards the Town Clock. Well, actually you're sitting at your computer, faking this using Google's Street View mode, but your view is a modern one, taken from the last time the Street View trucks passed through the town. What if you could now see that same view as it would have been in 1870? History Pin is a new site that can take archival photographs and align them to fit the landmarks and architecture of Street View imagery, allowing you to transition between today and the past from the same spot, to see cars and street lamps one second and an unfinished road and hay carts the next. Users can submit their own photos and stories to the map, which has content from around the world and when it reaches the point where there are many pictures in one spot, a timeline interface will guide you through the past.