BBC News presents an Interactive Map of Urban Growth, showing the dramatic growth of cities around the world.
An interesting aside:
This map uses the Gall-Peters projection, rather than the Gall projection usually used by the BBC. All flat, rectangular maps of the Earth contain some distortion of land size, shape and distance between countries. The Peters Projection minimises the distortion to land area, enabling the best comparison between regional populations and the size of the land masses they live on.