This church stands on the original site of the Abbey Church, torn down in 1807. See the relics of St. Geneviève and tombs of Pascal and Marat.
The church contains a unique choir screen, which you cannot see elsewhere in Paris. Particularly worth seeing is the golden reliquary, which preserved the remains of Sainte Geneviève, the patron saint of the city. In 1793, they were thrown out.
Guided tours are available (set up on a regular basis).
Official Website https://www.saintetiennedumont.fr/
Phone +33 1 43541179
Address Place Sainte-Geneviève, 75005 Paris, France
Coordinates 48°50'47.49" N 2°20'52.928" E