There's a world map with a similar style at lab.magiconch.com/world-ex/

Yep, that's what I did for mine 🙂

I coded it in React. Good mini project while I was learning the framework

The levels are open to interpretation, but I consider:
Stayed = overnight
Visited = a day
Stopped = during a journey

As for the map, I used www.mapchart.net/uk.html with a few minor changes e.g. merging very small areas like City of London

I am, thank you!

Thanks so much for sharing my project, really glad to see people are enjoying using it!