200 countries in 200 years
A famous 4 minute video by Hans Rosling and the BBC that shows the development of 200 countries over 200 years in terms of Life Expectancy and Wealth. As the 200 years progress, he identifies countries as coloured bubbles and explains historical events that move the bubbles around.
Further investigation of this data could use the Interactive World Statistics to see a current snapshot of demographics and development for any country around the world.