My new hobby: editing the Wikipedia of maps, OpenStreetMap (OSM). Click on the link and you’re greeted with a map of the world that’s been drawn entirely by its users. You can take this map and do literally whatever you want. Print it, download it, use it for your own maps, etcetera. And if something’s missing, you can just add it yourself. That’s amazing.
The map used to be painfully bare, but years of effort by volunteers are slowly making it surprisingly comprehensive.