Located across from the Plaza San Martin, this cathedral is one of the oldest in Argentina. On a sunday morning (noon, really), it was pretty quiet. Mass was later that evening.
San Martin is the guy on the 50-peso bill. He led Argentina in gaining independence from Spain, and also helped Chile and Peru do the same.
We stopped by later that afternoon to check out the beautiful interiors. A small group of people were doing the rosary in the cathedral. Outside, people sat around on the steps of the church hanging out. Some folks were feeding the pigeons. A pretty chill Sunday, for sure.
Visit their official website for hours etc.