La Crypte de Boulogne-sur-Mer

Developed in the 19th century around the remains of the Romanesque crypt, the crypt of Notre-Dame Basilica is an astonishing labyrinth of rooms and galleries extending beneath the entire surface of the basilica. A listed historical monument with walls covered in murals, it is also a museum space showcasing a treasure trove of sacred art and a collection of stone artifacts.

The largest crypt in France is a magnificent testament to 2,000 years of history!

Without further delay, discover the captivating atmosphere, exceptional remains, and precious collections of the crypt.

The official mobile app provides access to practical information to help you plan your visit, as well as comprehensive and detailed descriptions, in audio and/or text formats, covering some sixty points of interest related to architecture, archaeology, murals, the stone collection, and the treasury, accessible via self-guided or themed tours.

Discover it at home or in the crypt!

This app is also available in English.