Urban Scratchoff

Had no luck scratching off those lottery tickets your grandma put in your holiday card? Then here's a chance to scratch off something where everyone's a winner (well, at least history and map buffs). Urban Scratchoff is a fun interactive map that overlays historic aerial imagery from 1924 atop the same location in current time. Simply drag the mouse over a portion of the map to "scratch off" the present aerial view. You also have the option to swap the layers and have the current view on top.
More on the map