It's a bit off topic, but also this building represents Paris fin de siécle.

We all know what they did here a century ago, and if you don't know it, shame on you! At least read something: Martin Mystere or the Illuminatus!!!!

What do they do here now that we are facing the 3rd millennium, it's a nice little mystery.
At least we know that the book store at the ground floor has a rich collection of occult and mystic books.