The Art Deco swimming pool in Bruay-la-Buissière, located in the northern French department of Pas-de-Calais, has been named the "Favorite Monument of the French." This title was awarded by a public vote, in which the Roger Salengro swimming pool triumphed over thirteen other historic sites, including the Chartres Cathedral, the Petit Trianon in Versailles, and the Pic du Midi Observatory. The pool's victory highlights its unique blend of architectural beauty and historical significance. Constructed on August 1, 1936, the pool was built during a period of increased leisure time in France, thanks to the Popular Front government's introduction of paid vacation days. Designed by architect Paul Hanote, it showcases a "cruise ship" style typical of the late Art Deco movement. This design is marked by symmetry and clean, geometric lines, evoking the look of large transatlantic ships from the interwar period. Originally intended as a swimming school for the families of local miners, the facility is named after Roger Salengro, a socialist mayor of Lille and a former Minister of the Interior under the Blum government. Salengro died shortly after the pool’s opening. Today, the Roger Salengro swimming pool remains in active use, offering a range of facilities including three reinforced concrete pools, 200 individual cabins, four changing rooms, two terraced solariums, and four diving boards. It can accommodate up to 600 swimmers at once. Listed as a historical monument since 1997, it is the only open-air Art Deco swimming pool in France where visitors can still swim. In 2026, the pool attracted 50,000 swimmers, and the local government has decided to extend the season until December 30, allowing visitors to tour the site without swimming. An official evening event will be held on September 23 to unveil a commemorative plaque at the pool. This occasion marks the culmination of efforts to celebrate and preserve the site's unique heritage. The extension of the season and the plaque unveiling reflect the community's pride in this architectural gem and its enduring cultural significance.