The Cathedral of Setúbal (Sé Catedral de Santa Maria da Graça) sits on a small square in the old town, its plain white front giving little hint of the interior. Inside, the nave is lined with 17th-century blue and white azulejo panels of biblical scenes — a calmer, less crowded version of the kind of tile cycle you might queue an hour to see in Lisbon.
The church has been Setúbal's cathedral only since 1975, when the bishopric was created; before that the seat of the diocese was in nearby Évora. It is open most mornings and late afternoons, with a small donation requested for entry.