I was about to write how there is also a planet trail in Göttingen, Germany - but it turns out that there are a LOT of these trails scattered throughout Germany (List in German only [1])

Back in my youth I did not follow this trail actively, but I found it mind-boggling just how far apart from one another I would stumble over one of the planets.

[1] https://de.wikipedia.org/wiki/Planetenweg#Deutschland