The parish church at the southern end of Place du Marché, completed in 1777 as part of the Sardinian plan for Carouge. The façade is restrained neoclassical, but the interior is warmer — painted vaults, side chapels, and the kind of decoration you would not expect to find two tram stops from Calvinist Geneva.
The church is free to enter and is open most days. It is worth a brief look for the interior and for the contrast it provides with the Reformed churches of the old city across the river.