Heritage Days 2026 in Paris’s 9th Arrondissement: Your Guide

For two days each year, Paris opens doors that are usually closed. On 19 and 20 September 2026, the European Heritage Days return, and the 9th arrondissement is one of the richest areas to explore, from the Palais Garnier to the grand private mansions of Nouvelle Athènes. Here are the treasures to look out for and how to plan your weekend.

Heritage Days 2026: the dates

The 2026 edition takes place on Saturday 19 and Sunday 20 September. As every year, monuments, institutions and places that are usually closed offer special openings and guided tours. The detailed programme is released a few weeks before the event: consult it for opening times and bookings, as some particularly popular sites require registration.

Discover the treasures of the 9th arrondissement

The 9th arrondissement is full of heritage. The Palais Garnier, a masterpiece of the Second Empire, is the neighbourhood’s jewel. A few streets away, the Musée de la Vie romantique and the Musée Gustave Moreau immerse visitors in 19th-century Paris, while Nouvelle Athènes is lined with grand private mansions and discreet squares. The Folies Bergère, Hôtel Drouot and the domes of nearby department stores complete a route where every street has a story.

Planning your heritage weekend

In the 9th arrondissement, the sites are close together, so a weekend is enough to see several on foot. Prioritise morning bookings for places that require registration, leave visits without reservations for the afternoon, and take breaks in the neighbourhood’s cafés and covered passages. You can discover a whole arrondissement in two days without using the metro.

Cadet Residence, in the heart of the 9th arrondissement

For these two days, staying in the centre of the neighbourhood makes all the difference. Cadet Residence, an aparthotel at 7 rue Cadet, puts the Opéra, Nouvelle Athènes and the museums within walking distance, with accommodation equipped with a kitchenette for an independent weekend stay.

Heritage Days last just one weekend, and the most beautiful sites fill up quickly. To explore the treasures of the 9th arrondissement without rushing, book your stay at Cadet Residence.