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.