The Yvelines (78) never really slows down, and this weekend of September 19-20, 2026 proves it. In our travels across the 78, from Versailles to the Chevreuse Valley and through Saint-Germain-en-Laye, we’ve spotted plenty to keep everyone busy: flea markets, castles and monuments to visit, guinguettes, and pastries to explore.
Across royal estates, charming villages, and the banks of the Seine, the Yvelines never lacks opportunities to get out and about. To plan your escape, our guide to what to do in Yvelines gathers the finest addresses to explore year-round.
Before you head out, one quick precaution is in order: several RER, Transilien and metro lines will still be affected by work, as outlined in our breakdown of transport disruptions from September 14 to 20, 2026.
As for the weather, Météo-France is forecasting a pronounced cooldown across Île-de-France this week; bring a jacket. Pack a windbreaker in your bag and plan a few sheltered options (museums, castles) to avoid any nasty surprises in case of a shower.
Flea markets and garage sales in Yvelines on September 19–20, 2026 — 78
Fifteen flea markets and yard sales line up in Yvelines (78) this weekend of September 19–20, 2026, tucked between Versailles’s merchants’ braderie and the return of Conflans-Sainte-Honorine’s brocante. [Read more]
Heritage Days 2026: what’s on in Yvelines (78)
There’s plenty to do for the 2026 Heritage Days in Yvelines! On Saturday, September 19 and Sunday, September 20, 2026, head to the region’s many castles and museums in the 78 that will open their doors for guided tours, workshops, and memorable moments to share. [Read more]
This Yvelines pastry shop, home to macarons champions, unveils its new display case.
The pastry shop Le Jardin Sucré is reopening its historic boutique in Cernay-la-Ville, in the Yvelines, after a summer of renovations. France’s macarons champions Mélanie and Arnaud Mathez reveal, starting this September 2026, a fully redesigned botanical-inspired interior that invites guests to settle in and linger. [Read more]
Heritage Days 2026 at the Yvelines' castles: weekend program
What if we take advantage of Heritage Days 2026 to go on a quest for Île-de-France’s castles? This time, we’re heading to Yvelines to discover the majestic residences that will open their doors this weekend—Saturday, September 19 and Sunday, September 20, 2026. [Read more]
A medieval festival featuring knights and artisans in Saint-Arnoult-en-Yvelines (78) scheduled for September 2026.
The Middle Ages come back to life in Saint-Arnoult-en-Yvelines (78)! On September 19 and 20, 2026, the Moulin Neuf and the Parc de l’Aleu will host a large, free medieval stroll as part of Heritage Days. [Read more]
Carriages, confetti and fireworks: this historic festival is back in Montesson (78) in September 2026
Floats, confetti, a funfair and fireworks: the Fête du Pâté à la Carmen returns to Montesson on 19 and 20 September 2026. A popular Yvelines event that preserves a local tradition dating back more than a century and a half. [Read more]
Dynamik Parc, the multi-activity park in the Yvelines that’s going to blow you away
Installed quietly this summer at the heart of the Saint-Quentin-en-Yvelines Leisure Island, Dynamik Parc unveils a unique, multi-activity park dedicated to sport and recreation. Electric Drift Kart, Laser Tag, Bubble Foot, Archery Game, Big Football, VR, Hado, and other self-guided experiences are on the menu for those eager to discover. [Read more]
For Heritage Days 2026, discover the Domaine de Dampierre
For Heritage Days 2026, the Domaine de Dampierre-en-Yvelines (78) invites you to discover its program. On September 19 and 20, it will put its remarkable heritage in the spotlight. [Read more]
Explore the ruins of Port-Royal-des-Champs Abbey during the 2026 Heritage Days.
Step inside the Port-Royal des Champs Abbey in Magny-les-Hameaux for Heritage Days 2026. From hidden ruins and historic gardens to free strolls through the Yvelines, discover a landmark of Île-de-France's history on September 19 and 20, 2026. [Read more]
Heritage Days 2026 in Saint-Rémy-lès-Chevreuse (78): the program
In the heart of the Chevreuse Valley, an exciting town invites you to uncover its secrets and the illustrious figures who have walked its lands. For Heritage Days 2026, what if we wandered Saint-Rémy-les-Chevreuse? Here’s what to expect in this new edition! [Read more]
Where to dine in Yvelines? Top restaurant picks in the 78, tried and trusted
There's no shortage of good places to eat in the Yvelines. If you'd like to discover the best restaurants in the 78 department, here we go! [Read more]
Where to stay in Yvelines? Hotels, bed and breakfasts, and campsites in the 78 department.
The Yvelines, with its lush green landscapes and rich heritage, offers the ideal break just a few kilometers from Paris. Whether you're looking for a bucolic setting, a warm atmosphere or immersion in the heart of nature, there are several options available to visitors in search of escape. [Read more]
Ten offbeat parks and gardens in Yvelines, treasures to discover
What if we set off on a stroll to discover the loveliest original parks and gardens in Yvelines? From hidden, unique, historic spots to outright quirky or simply one-of-a-kind places, the 78 has no shortage of unusual gems for anyone looking to stray off the beaten path. We’re unveiling 10 parks, gardens, and green spaces to explore in the department. [Read more]
Where to have a good brunch in the Yvelines? Our top picks in the 78
Whether you live in the Yvelines or are just passing through, discover our top brunch spots in the 78. [Read more]
Where to have a good brunch in Versailles in the Yvelines? Our top picks in the 78
Looking for a good brunch in Versailles? Discover our top picks in the royal city of Yvelines, including artisan coffee shops, all-you-can-eat options, and family-friendly spots! [Read more]
What to do in Yvelines (78)? Heritage, good addresses and activities, ideas for outings
Want to get to know Paris Region better? This time, we're taking you to the Yvelines to discover its heritage, places to visit, must-do activities and the best deals of the moment. From castles to walks and good addresses, here's what's in store for you in the 78 département. [Read more]
Glorious Escape Game in Vélizy, the go-to spot for fun with friends or family in the Yvelines
Glorious Escape Game, based in Vélizy-Villacoublay (Yvelines), offers nine escape rooms: The Emperor's Heritage, Django, Asylum, Lost, The Anubis Stone, The Haunted House, Walking Dead, The Relics of Death and Pirate: The Talisman of Eternal Life. [Read more]
The most beautiful villages in the Yvelines, 7 must-see nuggets
Looking for a change of scenery less than an hour from Paris? The Yvelines (78) region is brimming with charming villages full of character. From Rochefort-en-Yvelines to Montfort l'Amaury, discover 7 Yvelines nuggets combining historic heritage and bucolic surroundings, all year round. [Read more]
Do remember to double-check opening hours before you head out, as some venues are still adjusting their entry policies this summer.
Enjoy your weekend in the Yvelines!
Dates and Opening Time
From September 19, 2026 to September 20, 2026
Recommended age
For all
