Roman ways

The mural on this railway tunnel in Bocholtz must represent the Roman past of the environment.
Apparently we have never cycled under this viaduct, because we have never seen it before. We also didn't know that every two years a Roman festival is held in Bocholtz. We already knew about a Roman road from Köln to Boulogne-sur-Mer, but have never done some research about it.
After our cycle ride, we did. There is a book and there is a cycle route. Bert is looking in to the opportunities for transport to Boulogne-sur-Mer, and I am curious about the book, so ordered it at our library.