Church of the Annunciation in Haute-Isle

Heritage Days 2026 at the Troglodyte Church of the Annunciation, an unusual stopover in the 95

On 19 and 20 September 2026, the European Heritage Days uncover the hidden treasures of Paris and Île-de-France. What's on the agenda in Val-d'Oise (95)? A gripping dive into history, right to the heart of the rock, to the region's only troglodyte church, tucked away in Haute-Isle.

Did you know? There's an unusual troglodyte church in the Val d'Oise, just waiting to be discovered.

Did you know that in the Val d'Oise, the Church of the Annunciation at Haute-Isle is the only troglodyte church in the entire region? Carved directly into a chalk cliff and listed as a historic monument, it's an unusual nugget to discover.