Saint-Henri is the south-west Montreal grew up working in, and the one Gabrielle Roy made literature out of: her Bonheur d'occasion set the whole quarter against the railway and the want. Four kilometres from the square she wrote about, along the antiques row, down to the canal that ran the factories.
Start at Place Saint-Henri, where the metro leaves you beside the church spire and the tracks. The square is the founding fact of the place; stand in it a moment. Then walk Rue Notre-Dame Ouest, the spine, lined with the antique and second-hand dealers the street is known for — brass, old radios, furniture nobody builds now. The dealers expect you to browse. Among them, the new cafés have moved in, and the two Saint-Henris share a block without much comment.
Cut down to the Lachine Canal, the green corridor that once carried the quarter's coal and grain, and turn east along the towpath with the old brick on one bank. It delivers you to Marché Atwater, the 1933 market under its deco clock tower. Buy something for the road; Lionel-Groulx is a block north.