Heritage Days 2025: guided tours of the astonishing Château de la Roche Guyon (95)

Did you know: a troglodyte castle is one that has been dug into the rock or into a cave. But a picture is worth a thousand words, and there's nothing better for understanding a subject than seeing it with your own eyes. So it's decided: this weekend, September 20-21, 2025, we're heading for the Val d'Oise to visit Château de la Roche Guyon, the one and only troglodyte castle in the Île-de-France region!

This spectacular monument, with its rich history, can be visited during the Journées du Patrimoine weekend. A not-to-be-missed opportunity to enjoy this architectural curiosity.

The Journées du Patrimoine (Heritage Days) are back in Paris and the Île-de-France region. This major cultural event continues to surprise and delight. And rightly so: the Ile-de-France region is brimming with historical and artistic nuggets, and this special event is designed to help us visit them all!

• To be read
• This week's top deals in Paris and Île-de-France, April 20–26, 2026.

Every year, the Journées du Patrimoine open the doors of thousands of castles, museums, places of worship and power, backstage theaters and gardens. These days showcase the heritage of every corner of France, from the best-known to the most secret... It's a real feast for the curious, eager to discover, and to get the best out of life.

Discover what awaits you at the Château de la Roche Guyon during the Journées du Patrimoine 2025:

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

And find out what else is on in the Val d'Oise this weekend.

Heritage Days 2025 in Val d'Oise: discover all the treasures of 95
The 2025 edition of the Journées du Patrimoine (Heritage Days) invites us to discover the little-known treasures of the Val d'Oise. From September 20 to 21, 2025, castles, museums and churches open their doors, revealing an exceptionally rich historical and cultural heritage. [Read more]