See how the floor turns into bricks? Not sure it leads you to the land of Oz, but that’s even rarer than cobblestones in Paris.
Take your time circling the tiny plaza, and at the end of the road, turn right once, and then right again onto rue des Liserons or Bindweed street.
It's hard to believe that, for a good part of the year, the village you're walking through used to be frozen ponds. I loved to come here to ice skate! Some people would break the ice, and bury it in specially designed wells, sandwiched between layers of straw for insulation. This gave the name of the neighbourhood “Glacière”, for “ice box”, as they would then use the ice later in the year. A nearby metro station is still called "Glacière", and it can get pretty chilly when the wind blows on its open air platform. Just thinking about it cools me down.