Time lapse satellite images, 1984-2012 MAY 10 2013
Working with the USGS, NASA, and Time, Google has built a viewer for satellite image time lapses. Among the images are those of the deforestation of the Amazon rainforest, the retreat of an Alaskan glacier, and the growth of Dubai. You can also refocus the map on any other area you want. More info here and here's the extensive Time feature.