The crypt is located beneath the square in front of Notre-Dame. Former wall of Lutetia, the Roman town ancestor to Paris, 4th century AD. Former wall of Lutetia, the Roman town ancestor to Paris, 4th century AD. Roman pier of a harbor. The Seine river now flows 55m from this location. Image of the area in front of Notre-Dame before the 1772 fire. Bath house rooms, used until the 5th century. Bath house rooms, used until the 5th century. Bath house rooms, used until the 5th century. Labels