This time something on the lighter side. Where are the databases? See this map:
I am going down the list at http://db-engines.com/en/ranking and will add more over time. Since Google Maps only shows the physical world, I was not able to place the open source projects onto the map:-)
Only headquarters are put on the map, with one exception.
If I missed your database, or you don’t want to wait until I get to it myself, please send me an email or add a comment to this blog with a link to your database.