I just stumbled on this remarkable art project by Tom Phillips (his Humument project was mentioned here earlier by Geoffrey in connection with emergent/altered texts). He has created slideshow galleries of 20 locations around London that he has photographed once each year for the last 35 years. Watching, we see some sites barely change while some are dramatically altered.
Oddly, what struck me most was the transformation of the cars: abstractly I remember those generations of cars (or their north american relatives) from my childhood on up, though I can no longer place them in any visual context in memory, except in a sort of cinematic way.