The Monnaie de Paris has been striking coin since 864, when Charles the Bald set up a royal minting workshop in the city. It calls itself the oldest institution in France, and the claim rests on never having stopped — not on the walls, which are far younger, but on the work carried on inside them without a break. The institution is more than nine hundred years older than the building you are standing in. Walk the riverside front and you are looking at an eighteenth-century answer to a ninth-century job.
Antoine designed a factory with a palace front: an Ionic portico on the river, courtyards behind it, and a production line laid out through the middle so that metal moved from one operation to the next. Everyday coin left for a plant at Pessac in 1973. What stayed in Paris is the slow work: medals, art castings and collector pieces, each one cut, struck and finished by hand. The building still does the job it was built for, which almost no building of its age anywhere does. The courtyards are open, and most people on the quay walk past a working foundry without noticing.