Heritage Days 2025: the European Space Agency headquarters in Paris opens its doors

On the weekend of September 20 and 21, 2025, fasten your seatbelts and prepare to orbit the treasures of the past! The Journées du Patrimoine (Heritage Days) are back in Paris and the Île-de-France region: museums, private mansions, emblematic institutions and unusual places are unveiled free of charge, sometimes for the first time! It's the perfect opportunity to lose yourself in historic corridors, unearth hidden treasures and experience history with curiosity and light-heartedness. In just two days, each visit becomes a mission of exploration in its own right, with each address harboring its own secrets to be discovered.

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]

This year, the program takes on a cosmic dimension: the headquarters of the European Space Agency (ESA) opens its doors to the public for the first time on Saturday, September 20! This strategic site coordinates European space missions, satellites and scientific projects. Here, we scan the Earth from space, prepare planetary exploration missions and develop technologies that will take Europe into infinity. For the public, this exceptional opening gives a behind-the-scenes look at an organization that is usually out of reach, an insight intoESA 's key role in observation, navigation and the conquest of space, and a close-up look at the workings of a center that takes Europe... literally to the stars.

• To be read
• This week's top picks in Paris and Île-de-France, April 6–12, 2026.

2025 Heritage Days program at the European Space Agency (ESA) headquarters:

Aucun événement annoncé à ce jour, le programme est mis à jour en fonction des annonces officielles.

Between earthly heritage and cosmic adventure, the Journées du Patrimoine 2025 promise a weekend rich in discovery and wonder. Get ready for take-off!