Map of Scientific Collaboration by Oliver H. Beauchesne & Scimago Lab
This map shows the collaboration networks between researchers in different cities. Apart from its aesthetic qualities, the map is useful to illustrate some interesting collaboration patterns. One of the most striking one is the importance of Paris in French science. It seems that every researcher in France collaborates with at least a researcher in Paris. Unsurprisingly, the map also shows quite clearly that the location scientific institutions follows the population density. Also, links between countries and their old colonies are also very obvious.