What if heritage meant more than just the capital’s historic buildings? For Heritage Days 2026, anyone looking for a nature getaway in Île-de-France can head to Essonne. Every year, this major early-autumn event opens the doors free of charge to iconic, unusual and little-known places across the Paris region. On September 19 and 20, 2026, the event invites visitors to take a fresh look at our cultural and landscape heritage.
Nestled between the towns of Villabé and Lisses, the Domaine de Montauger is a fine example of the Île-de-France tradition of country estates. Originally built in the 18th century and remodeled in the 19th, the main residence features understated neoclassical architecture, with symmetrical façades and a regular layout. According to local legends, the site may have housed secret underground passages linking former seigneurial outbuildings in the area, although no archaeological excavation has formally confirmed the existence of these galleries.
Acquired and restored by the Essonne Departmental Council, Montauger is now home to the Maison de l'Environnement. The site covers around 15 hectares and combines a formal French garden, a heritage orchard and wetlands. The latter are an essential link in the ecological chain: the peat bogs and reed beds of the lower Essonne Valley are home to protected plant life, as well as numerous species of migratory birds and amphibians. The site's mission is simple: to raise awareness of natural balances among visitors of all ages through accessible, educational observation trails. To plan your visit during this weekend of discovery, see the detailed programme of activities below.
European Heritage Days - Musical performances
Let yourself be carried away by a warm, musical atmosphere—perfect for sharing a convivial moment in the great outdoors. A genuine moment of emotion, centered on timeless jazz standards, beautiful ballads, and the essentials of French chanson… not to mention a host of other musical surprises!
First session from 1:45 p.m. to 2:30 p.m.
Second session from 4:00 p.m. to 4:45 p.m.
Participation requirements: Free | No reservation required
Schedule: Saturday, September 19, 2026 — 1:30 PM to 4:45 PM
Conference: "The Photographic Treasures of Essonne's Heritage"
Invented in 1826, photography quickly began documenting the region’s landscapes, buildings, and castles, and by the end of the century postcards spread the image of countryside, forests and rivers where it’s pleasant to vacation. Photography preserves memory but also embellishes history. Can we trust it? An investigation by Inspector Franck Senaud, a painter and art historian and author of “Dessein d'Essonne”.
Participation conditions: Limited to 60 attendees — reservation required | Free — https://www.essonne.fr/rendez-vous-nature/journees-europeennes-du-patrimoine-conference-les-tresors-photographiques-du-patrimoine-essonnien
Timings: Saturday, September 19, 2026 — 2:30 p.m. to 4:00 p.m.
European Heritage Days - Montauger Castle opens its doors to the public
Beyond the gates of the Estate, discover the château from a different perspective. On a guided tour, you’ll collect anecdotes about the old historic residence before its restoration by the Department, about the architecture of the building and the small Park, and about the various families who once inhabited the grounds.
Participation conditions: Limited to 25 participants - Free | Reservation required - https://www.essonne.fr/rendez-vous-nature/journees-europeennes-du-patrimoine-le-chateau-de-montauger-vous-ouvre-ses-portes
Schedule: Sunday, September 20, 2026 — 4:00 PM ⤏ 5:00 PM
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Dates and Opening Time
From September 19, 2026 to September 20, 2026
Location
Domaine départemental de Montauger
Domaine départemental de Montauger
91090 Lisses
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