The Journées du Patrimoine are finally back! This weekend, September 20 and 21, 2025, we're off to conquer the most beautiful treasures of Paris and the Île-de-France region with free visits, unusual events and exceptional openings. Museums, monuments, châteaux and other unusual sites will be revealing their secrets for the occasion. As you can see, this is the event not to be missed in September. Especially if the Paris region is your playground. So, would you like to discover the program that awaits you?
Heritage Days 2025: not-to-be-missed sites in Essonne (91)
The Journées du Patrimoine 2025 offer a unique opportunity to visit and admire the hidden treasures of Essonne (91). From September 20 to 21, 2025, you'll be able to discover historic places and unusual sites that open their doors for the occasion. A weekend not to be missed. [Read more]
The Journées du Patrimoine are back again this year for an exceptional edition, taking place on Saturday September 20 and Sunday September 21, 2025. This not-to-be-missed cultural event offers you the chance to visit over 1,500 sites in Paris and the Île-de-France region. While the major museums and emblematic monuments are on the program, it's also an ideal opportunity to explore secret sites that are little-known or inaccessible the rest of the year. [Read more]
The historic monuments of Paris and the Île-de-France region open their doors to you for the 42nd European Heritage Days. This Saturday, September 20 and Sunday, September 21, 2025, come and discover these jewels of history, through attractive programs for the whole family. [Read more]
If you're in Essonne, or would like to explore this département to visit its finest treasures, then it's time to show you an unusual spot that awaits you in the town of Viry-Châtillon. Head for the Domaine du Piédefer to discover this rare curiosity. This is the Nymphée Nymphée, a mysterious grotto whose walls are covered with shells and rocks arranged to create a surprising pattern. It's one of the last vestiges of this type of decoration, very popular in Louis XIV's time. It was listed as a Monument Historique on March 22, 1983.
For the Journées du Patrimoine 2025, the Nymphée awaits you on the weekend of September 20 and 21, 2025 from 2:30 to 5:30 pm fora free visit. It's also an opportunity to explore the Domaine du Piédefer and its lush green landscape.
Piedefer Estate
Le programme est mis à jour en fonction des annonces officielles.
Théâtre de Verdure
Le programme est mis à jour en fonction des annonces officielles.
A place of surreal beauty, not to be missed!
Dates and Opening Time
From September 20, 2025 to September 21, 2025
Location
Piédefer Park
26 Rue Maurice Sabatier
91170 Viry Chatillon
Prices
Free
Heritage Days 2025: not-to-be-missed sites in Essonne (91)
Heritage Days in Paris 2025: secret, little-known or hidden places to discover this weekend
Journées du Patrimoine 2025: not-to-be-missed historic monuments in Paris and the Île-de-France region
