Route of Megalithic Culture
The Route of Megalithic Culture (German: Straße der Megalithkultur) was first created as a tourist route that meanders from Osnabrück to Oldenburg in North-West Germany. Signposted with brown road signs it links many places of archaeological interest from the Megalithic era.
Source: Wikipedia — Route of Megalithic Culture (CC BY-SA 4.0)