The Cathedral Basilica of Saints Peter and Cecilia stands in the pedestrianised centre of Mar del Plata, two blocks from the main square. The building is in neo-Romanesque style, with twin towers and a rose window over the main entrance. Inside, the nave is long and well-proportioned, with good stained glass and a calm that contrasts pleasantly with the busy city outside.
The cathedral is the seat of the Diocese of Mar del Plata and is open daily. The pedestrian precinct around it, including the Plaza San MartÃn, is the city's main gathering place on weekday mornings and evenings.