Timeline

Heritage classified

Key figures

Origin and history

The Troglodytic church of the Annunciation, located in Haute-Isle in Val-d'Oise, is an architectural singularity in Île-de-France. It was dug between 1670 and 1673 in a chalk cliff at the initiative of Nicolas Dongois, local lord, and was built after the village was built in the parish. Unlike troglodytic houses, it does not have a masonry facade: the rough rock forms its exterior, while the unique nave, vaulted in a cradle, extends 20 meters long.

Only the bell tower, square and covered with slate, emerges from the ground. The interior, illuminated by four stone-cut windows, houses a 17th century carved wooden altarpiece and a golden wood choir fence, both classified as historical monuments. The church, closed in 1999 for risk of collapse, was reopened after discussions on its restoration. It remains an active place of worship within the pastoral sector of Magny-en-Vexin.

Ranked a historic monument in 1926 for its unusual character, this church is the last example of a troglodytic religious building in Île-de-France, since the destruction of Mousseaux-sur-Seine in 1749. His furniture, including the altarpiece and the choir fence, bears witness to his history linked to the local seigneury. Despite controversial restoration projects, it retains its mineral authenticity and its role in regional religious life.

The terrace cemetery, located at the foot of the cliff, precedes the entrance of the church, highlighting its integration into the landscape. The nave, 20 meters wide and 8 meters high, offers a sober space where rock dominates. The offices are always celebrated there, perpetuating a tradition of more than three centuries old.

Future

The church is now reopened and remains one of the places of worship in the pastoral area of Magny-en-Vexin regularly welcoming religious services and ceremonies.

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