THE UNDERGROUND PASSAGES OF PONTOISE
Discovery site
2025
Recommended
2025
Underground tunnels in Pontoise, dug to extract building materials and store foodstuffs.
Few people know it, but the city of Pontoise has a very important network of underground galleries located under the historical center of the city, which extends on a plateau called Mont Bélien. The subsoil was dug for centuries in order to exploit the limestone, which was used to build the houses. In some places, several levels of galleries are superimposed. You can reach them by masonry and vaulted staircases that go down into the depths. It's magical!
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