Musée Picasso, Carnavalet, Couvent de la Merci: the 3rd arrondissement opens its doors for Journées du Patrimoine 2026
A weekend for opening doors you never usually push: the Journées du Patrimoine 2026 in Paris’s 3rd arrondissement offer that rare chance to cross thresholds that are normally closed to the public. On 19 and 20 September 2026, this upper Marais neighbourhood throws open its museums, convents and libraries for a 43rd edition packed with discoveries.
Hidden gems within reach this weekend in the 3rd
Some spots in the 3rd arrondissement remain unknown even to long-standing Parisians, and this is the perfect moment to catch up on them. The Couvent de la Merci opens its doors exceptionally over both days, a rare event that is well worth the trip. Equally, the central library of the Conservatoire national des arts et métiers, housed in a former monks’ refectory, reveals itself to visitors: an unjustly overlooked space that never fails to surprise with its character.
The Institut Suédois, meanwhile, offers guided tours of the hôtel de Marle, the historic building it calls home. This architectural gem in the 3rd arrondissement is perfectly suited to the Journées du Patrimoine format, blending the history of Parisian architecture with a living cultural presence. Tours are scheduled for both Saturday 19 and Sunday 20 September 2026.
The neighbourhood’s major museums are in on it too
The better-known institutions are also fully on board. The Musée Picasso opens free of charge for the entire weekend, a genuine perk for visitors wanting to (re)discover its collections without spending a cent. It is one of the top tips to keep in mind for the Journées du Patrimoine 2026 in Paris’s 3rd arrondissement.
The Musée Carnavalet, dedicated to the history of Paris, offers guided tours of its collections on 19 and 20 September 2026. For anyone wanting to understand the capital in real depth, it is an ideal entry point. The Musée Cognacq-Jay, nestled in the heart of the 3rd arrondissement, also opens its doors to the public for the weekend: a little-known address in the city, and a genuine discovery waiting to happen.
- Musée Picasso: free entry on 19 and 20 September 2026
- Musée Carnavalet: guided tours of the collections
- Musée Cognacq-Jay: open to the public for the weekend
- Musée de la Chasse et de la Nature: free self-guided visit, exhibition included
- Archives Nationales: tours of the hôtel particulier and the exhibitions
Science, invention and national heritage all have a place
The Musée des Arts et Métiers is also part of the heritage weekend’s programme. It offers free visits and activities on both Saturday 19 and Sunday 20 September 2026, with a schedule designed to appeal especially to children, making it a fully-fledged family option for the Journées du Patrimoine 2026 in Paris’s 3rd arrondissement.
The Archives Nationales de Paris are likewise opening their doors for the 43rd edition. On the agenda: tours of the hôtel particulier and access to the exhibitions, across both days of the weekend. A site steeped in national history, rarely accessible under these conditions.
How to plan your visit in the 3rd arrondissement
With so many venues open at once, it pays to map out your route in advance. The Musée de la Chasse et de la Nature offers a free self-guided visit including the exhibition, giving you complete freedom to go at your own pace. Other sites, such as the Institut Suédois and the Musée Carnavalet, operate on guided-tour time slots, which means checking schedules ahead of time is essential.
The dedicated page for the Journées du Patrimoine 2026 in Paris’s 3rd arrondissement is updated as announcements come in, so it is worth checking back regularly before the weekend to avoid missing any programme changes. This Parisian neighbourhood, straddling the upper Marais and its great cultural institutions, transforms into a full-blown heritage marathon on 19 and 20 September 2026.
