Heritage Days 2025: discover the conical air-raid shelter at Villenoy (77)

Good news for history and heritage enthusiasts! The Journées du Patrimoine (Heritage Days) return on Saturday September 20 and Sunday September 21, 2025 , with two new days of enriching events. Every year at the same time, this major cultural event is an opportunity to push open the doors of numerous museums and monuments throughout France.

In Paris and elsewhere in the Île-de-France region, institutions, castles, unusual, hidden and little-known places, cemeteries and artists' homes are all taking part in the event, with guided or self-guided tours.

Journées du Patrimoine 2025 (Heritage Days 2025): visits to castles in Seine-et-Marne (77)
The Journées du Patrimoine (Heritage Days) also invite you to discover the châteaux of 77. In Seine-et-Marne, a great program awaits you in these royal residences: discover the ideas for outings this weekend of September 20 and 21, 2025. [Read more]

Journées du Patrimoine 2025: unusual outings for an original weekend in Paris
Think you know everything about Paris? Well, we can still surprise you! This weekend, Saturday September 20 and Sunday September 21, 2025, you're in for a real treat at the Journées du Patrimoine! We're sharing our picks for the 42nd Journées du Patrimoine, in Paris and the Ile-de-France region. [Read more]

Journées du Patrimoine 2025 in Paris and Île-de-France: book your weekend visits now
The Journées du Patrimoine (Heritage Days) are back on the weekend of September 20 and 21, 2025 in Paris and the Île-de-France region. For the occasion, you'll be able to take part in some exciting programs, some of which require registration. We take a look at these tours, for which you'll need to make a reservation. It's up to you! [Read more]

If you live in Seine-et-Marne and would like to discover an unusual place, then head for the commune of Villenoy to push open the doors of the famous conical anti-aircraft shelter. Described as a unique monument on a national scale, the Villenoy conical air-raid shelter was awarded the Heritage of Regional Interest label in November 2021.

Built in 1939-1940, this air-raid shelter is distinguished by its 18-metre-high conical silhouette. Its cone is visible from the back of the Hôtel de Ville park. Another special feature? The shelter has 8 levels and could house up to 120 people.

The Villenoy conical air-raid shelter is full of anecdotes and secrets. Come and discover them during the European Heritage Days on September 20, 2025.

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The Journées du Patrimoine 2025 program at the Villenoy conical air-raid shelter

• Visit the conical air-raid shelter
  Saturday, September 20, 2025 - 10:00 ⤏ 12:00, 15:00 ⤏ 17:00
  

  Witness to the 1939-1940 period, this unusual conical shelter, 18 meters high and the only one of its kind in France, was intended to shelter sugar factory personnel during air raids.