Journées du Patrimoine 2025: tours and events for all at the Palais d'Iéna in Paris

For the Journées du Patrimoine (Heritage Days), the Palais d'Iéna, headquarters of the Economic, Social and Environmental Council (CESE) in Paris, is opening its doors to visitors on Saturday September 20 and Sunday September 21, 2025.

On the occasion of the European Heritage Days 2025, the Economic, Social and Environmental Council, better known by its acronym CESE, is opening the doors of its prestigious Parisian offices, housed in the sumptuous Palais d'Iéna, on Saturday September 20 and Sunday September 21, 2025.

Every year, during the Journées du Patrimoine (Heritage Days), a large number of sites open their doors to the general public, enabling them to discover a sometimes little-known heritage through visits to some of the world's great institutions, museums and historic monuments.

Heritage Days 2026 in Paris (75): a district-by-district lineup of visits
For the 2026 Heritage Days in Paris, the capital’s monuments and historic sites throw open their doors (often for free) to reveal their secrets to us. Don’t miss this essential event, scheduled for the weekend of September 19–20, 2026, under the themes: "Heritage in Peril" and "Heritage of Photography". [Read more]

Heritage Days 2026 in Paris: unmissable openings and exclusive tours
The Heritage Days 2026 in Paris also offer a chance to discover places that are usually off-limits to the public. Here’s our list of sites that will open their doors to you for a limited time this weekend of September 19–20, 2026. [Read more]

For this 42nd edition of the Journées du Patrimoine, come and discover the fascinating Palais d'Iéna in Paris, home to the Economic, Social and Environmental Council (CESE).

Built from 1937 to 1946 by Auguste Perret, the Palais d'Iéna opened its doors in 1939 as the Public Works Museum. Then, from 1956 to 1958, it became the headquarters of the Assembly of the French Union. Since 1959, it has housed the Conseil économique, social et environnemental, the Republic's third constitutional assembly. This work by Auguste Perret is remarkable for the vastness of its spaces and the quality of the materials used, particularly concrete.

On September 20 and 21, come and discover the Palais d'Iéna, as well as the workings and challenges of this republican institution.