Ragtag Map of Wikipedia Articles
The Ragtag blog has created a Google Map of every Wikipedia page tagged with a latitude and longitude. 424,171 articles in Wikipedia have been geotagged. You can see the geographical distribution of the articles in the heat map above.
Ragtag were also able to find 14,238 historical events that were geotagged on Wikipedia. By plotting the events by year and location Ragtag have managed to create a dynamic visualisation that gives a rough idea of the history of the world in 100 seconds.