A medieval village in downtown Paris

Cities, like epidemics, once they start growing rapidly, overcome everything in their way. No one person or entity ever decrees definitively the borders of a city; instead, like an ink stain on paper, cities spread chaotically, sometimes outward and sometimes back inward.
When things get ridiculous, authorities intervene to build ring roads, tunnels, green zones, overpasses and other afterthoughts to manage the chaos.
Once in a while, however, a miracle survives in the middle of all this mess: welcome to the medieval village in the heart of Paris!