3 Days to Kill|Pont Alexandre III — the nightclub in the vaults and the daughter he pulled out of it

Most visitors cross Pont Alexandre III on top, past the gilded Fames and the art nouveau lamps, and never learn that the bridge has an underside with a door in it. On the Left Bank abutment, built into the stone vault where the deck meets the quay, there is a club. Under its various names — Showcase, then Faust — it has been one of the odder nightlife rooms in Paris: a barrel-vaulted cavern of raw stone directly beneath one of the most decorated bridges in Europe, with the Seine slapping the wall outside.

The film sends Ethan down there to retrieve Zooey. It is the scene where the two halves of the character stop pretending to be separate: the man who has spent the movie failing to be a father walks into a basement full of strangers and handles it exactly the way he handles work. He does not raise his voice much. He does not need to.

Go in daylight first and take the stairs from the bridge down to the Port des Champs-Élysées on the Right Bank, then walk under the arch and look up. The vault is enormous, the acoustics swallow the traffic, and you can see the service doors set into the masonry. The bridge above was a diplomatic gift, laid out flat and low so it would not block the view of the Invalides — which is why the vaults underneath are so wide and so usable.

Stand under the arch at night, with the deck lit gold above and bass coming through the stone, and the film's logic stops being a screenwriting trick. Paris really does keep a room like that under its prettiest bridge.

Location photos: free-licence stock photography of Pont Alexandre III (Pexels).