I wrote about the pilgrim trail in a previous post, but there are also more modern trails you can follow. If you look down as you walk in Liège, Belgium, you might see one of these little brass circles.
My first thought was "Oh, so he lived here! I had no idea." George Simenon, the author of the books about detective Maigret, was from Liège. I remembered watching the TV series based on his books many moons ago in Sweden.
I instantly recognised Maigret's trademark pipe and hat, and I also understood that the small arrow was pointing in the direction you ought to walk if you wanted to get to the next place of interest. Putting down little markers like these is a simple but clever way of both leading people along the trail and bringing it to the attention of somebody who happens to come across it, like in my case.
We never had time to follow the trail, but we did find Mr Maigret sitting on a bench. Looked like he had been sitting there for a while, possibly trying to find a solution to a particularly tricky case.