Yes, the first image in the README is from cities.go. The data file is too big so I didn't include it in the repo, but the Makefile will fetch it.

https://github.com/mmcloughlin/globe/blob/master/examples/Ma...

It came from this node package

https://www.npmjs.com/package/cities.json/

It looks like the dataset has more cities in some countries than others.