Look along the Corderie Royale and notice how far it stretches beside the Charente. It was built in the 17th century as a royal rope factory, and its length was part of the job: hemp had to be twisted over a very long distance to make strong ship’s rope. That means this was not just a workshop, but part of naval power itself, because the fleet depended on supply as much as on ships. If you step inside, the rope demonstrations and exhibition rooms make that craft feel real, and if you look up, the roof structure is worth a careful look too. Then take a short walk through the Arsenal, where the same river setting still makes sense of why this complex was built here in the first place. If you came expecting L’Hermione, note that the frigate is not in Rochefort now; the free information point at Amiral Dupont square is the place to learn why.