The medallion, one of dozens others, is on a line that continues due north from the musée du Louvre.
  

An Arago Plaque embedded in a couple of paving stones of galerie de Montpensier, a balustraded walkway along the western side of the jardin du palais Royal.

Go to the index page of pictures of the Louvre.

Take a look at the pictures I’ve taken on trips to Italy

See the pictures I’ve taken in the United States

Take a look at the photographs I’ve taken in Canada