If Paris can turn a disused train station into a world-class museum (the Musée d'Orsay), why not take an art deco municipal swimming pool (built 1927–32) – an architectural masterpiece inspired by a combination of civic pride and hygienic high-mindedness – and transform it into a temple of the arts? This innovative museum, 12km northeast of Gare Lille-Europe, showcases fine arts, applied arts and sculpture in a delightfully watery environment.