Discover Château de la Madeleine during the 2026 Heritage Days.

For Heritage Days 2026, held on September 19–20, the Château de la Madeleine in Yvelines is offering special, free tours for everyone. Here’s the weekend program.

For two days, Paris region residents will have the chance to discover the area’s finest sites, thanks to a new edition of the Journées du Patrimoine. The weekend of September 19–20, 2026 invites you to explore the historic monuments you’ve always wanted to visit while they’re open to the public, the most beautiful churches or castles spread across the departments of Île-de-France. A large number of activities are organised for free, notably in the Yvelines.

Have you heard of the Château de la Madeleine in the heights of the Vallée de Chevreuse? This magnificently preserved fortified castle, built between the 11th and 14th centuries, is a fortress located in Chevreuse. Its construction was ordered by Gui I (lord of the Montlhéry-Rochefort branch), to defend the valley from numerous enemy attacks. A true model of its kind: moat, keep, machicolations, drawbridge, chapel, towers and ramparts... it has all the attributes for a medieval immersion!

Since the 11th century, this château has witnessed all the major events inFrench history. A long epic to discover during the Heritage Days.

Heritage Days 2026: a fantastic program to discover in Yvelines (78)
There’s plenty to do for Heritage Days 2026 in Yvelines! On Saturday, September 19 and Sunday, September 20, 2026, head to the numerous castles and museums in the 78 that will open their doors for guided tours, workshops, and memorable moments to share. [Read more]

Heritage Days 2026 program at Château de la Madeleine

Guided Archaeological Tours
Seine-et-Yvelines Archaeology’s primary objective is to carry out preventative archaeology. This body also pursues scientific research, inventory work, collection management and conservation, advisory services for developers, and the promotion of the two departments’ archaeological heritage.

Sunday, September 20, at 11:00, 1:30 p.m., 3:00 p.m., 4:00 p.m. and 5:00 p.m.

The Château de la Madeleine invites the public to travel back in time and discover how archaeological excavations have unveiled the castle’s history and the daily life of its inhabitants through the centuries.

• Guided archaeological tours

Free – open to all
Participation terms: Free | No reservation required
Schedule: Sunday, September 20, 2026 – 11:00–12:00, 13:30–14:30, 15:00–16:00, 16:00–17:00, 17:00–18:00

Happy Heritage Days in Yvelines!