Boulogne-Billancourt is a wealthy area in the inner south-western suburbs of Paris. With its approximately 121,000 inhabitants (2018), it is the most populous municipality in the Paris urban area after the city of Paris, and one of the most densely populated. Although not a major tourist hub, it is nonetheless worth a visit for its 1930s heritage. Bordered by the river Seine to the south and west, by the Bois de Boulogne to the north and by the 16th arrondissement of Paris, Boulogne-Billancourt is the most populous municipality in Ile-de-France after Paris 'intramuros'. Its central position on the old East-West road of Versailles, between the Royal Palace of the Louvre is at the origin of its development. Today, it continues to develop thanks to its intermediate position on the north-south axis, between the economic hubs of La Défense and Vélizy-Villacoublay. For nearly two centuries, Boulogne-Billancourt has been known for its technological innovation, home to the first suspension bridge in 1824, the design of the first automobile gearbox, and the first place outside Paris intramuros to be connected to the Paris metro in 1934. The cultural golden age of Boulogne-Billancourt was undoubtedly the inter-war period, and more precisely that of the 1930s, which results in it being home to a large amount of notable Art Deco architecture from that period. It was also during the first half of the 20th century that Boulogne became the city of aircraft engines and cinema, and saw the establishment of the vast factories of the car manufacturer Renault (on what is now the Ile Seguin), whose primary headquarters are still found in the suburb. The suburb is primarily served by metro lines  9  (Pont de Sèvres, Billancourt and Marcel Sembat) and  10  (Pont de Saint-Cloud, Jean Jaurès), and is in fare zone 2. Line 10 feels like it belongs in a museum from the Second World War and is quite fun to ride. The new line 15 is scheduled to open in the mid-2020s as part of the Grand Paris Express scheme, and will connect Pont de Sèvres station with the surrounding inner suburbs of Paris. Parc de Saint-Cloud station on tram line T 2  is a short walk across the river Seine from Pont de Saint-Cloud metro station, as is Brimborion station from Pont de Sèvres metro station. Although the RER does not serve the commune directly, the RER  C  serves Issy - Val de Seine station located just across the Seine in the neighbouring commune of Issy. Two free shuttle bus routes around the commune are provided by the Service Urbain de Boulogne-Billancourt (SUBB), and are adapted for people with disabilities. A map and timetable are provided on the council website. 48.8414382.2279831 Albert Kahn Museum (Musée Albert-Kahn), 10 Rue du Port (Pont de Saint-Cloud 10 ). The former estate of the Edwardian philanthropist Albert Kahn, consisting of a beautiful botanical garden and a museum of early 20th-century colour film/photography documenting various world cultures and remote tribes. While the museum is closed for renovation until Autumn 2021, the gardens remain open and entry is free on the first weekend of each month. (updated Jun 2021) 48.8433862.2512942 Immeuble Molitor, 24 rue Nungessor & Coli. An 8 storey block or flats, built in 1932–1934, part of Le Corbusier World Heritage   48.8362792.2397133 Museum of the 1930s (Musée des Années Trente), Espace Landowski, 28 Avenue André Morizet (Marcel Sembat 9 ). A municipal museum specializing in the fine arts, decorative arts, and industrial arts of the 1930s (updated Apr 2019) 48.8432772.2463484 Marmottan Library (Bibliothèque Marmottan), 7 Place Denfert-Rochereau (Jean Jaurès 10 ). Museum library of books from the Napoleonic era (updated Jun 2021) 48.8474652.2329835 Paul Belmondo Museum (Musée Paul-Belmondo), 14 Rue de l'Abreuvoir. Tu-F 14:00-18:00, Sa Su 11:00-18:00. Museum dedicated to the sculptor Paul Belmondo (updated Jun 2021) 48.8503972.2299676 Parc Edmond de Rothschild, 3 Rue des Victoires. Charming little park and Japanese garden around an old derelict stately home (updated Jun 2021) 48.8379852.2561121 Le parcours des années 30 (Porte de Saint-Cloud 10 , Jean Jaurès 10 ). Self-guided walking tour of Boulogne-Billancourt's 1930s architectural heritage starting from Porte de Saint-Cloud and ending at Jean Jaurès metro stations. (updated Jun 2021) 48.8237812.2332422 La Seine Musicale (Pont de Sèvres 9 , Brimborion 2 ). Classical music venue on the Ile Seguin. (updated Jun 2021) The commune has a very large array of restaurants for all tastes, with a major concentration around the Marcel Sembat area. 48.8347622.2520081 La Can Tinh, 5, rue de Vanves, ☏ +33146081412. M-F 12:00-15:00, W-F 19:00-23:00. (updated Jan 2022) 48.8315192.2467831 Boulogne Résidence Hôtel, 32 Rue des Longs Prés, ☏ +33149100545. 3 stars. €90. (updated Jan 2022) Saint-Cloud 16th arrondissement and the Bois de Boulogne
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