All the houses on rue Fleurus look pretty much the same. And then you come to number 14, the Maison Coilliot.
The original owner, M. Coilliot, wanted something different, so he commissioned Hector Guimard, the architect responsible for many of the Paris Métro entrances, to redesign his house. Guimard combined volcanic rock, cast iron, and Coilliot’s own ceramics to create this wonderful Art Nouveau facade with its swirling decorative motifs. It’s still a private residence, so you can’t see the interior. Even so, it’s well worth a visit if you’re in Lille.