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.

Journées du Patrimoine 2025 in Paris (75): full schedule of visits by arrondissement
For the Journées du Patrimoine 2025 in Paris, the capital's historic and artistic monuments and landmarks are opening their doors (often free of charge) to let us in on their secrets. Don't miss this not-to-be-missed event, scheduled for the weekend of September 20 and 21, 2025, on the theme of "Architectural Heritage". [Read more]

Journées du Patrimoine 2025 in Paris: must-see openings and exceptional tours
The Journées du Patrimoine 2025 in Paris is also an opportunity to discover places that are usually closed to the public. We've put together a list of places that will be opening their doors to the public on the weekend of September 20 and 21, 2025. [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.