It's fascinating to explore different belief systems. An outing to Iglesia Dinamarquesa is a fantastic way to deepen your understanding of one of the local religions and ways of life.
You'll have no end of sightseeing choices in San Telmo. Iglesia Dinamarquesa is a good place to begin here, but there are loads of other interesting sights to consider. Obelisco, Colón Theatre, and Casa Rosada are not far from the house of prayer and will round out your day nicely.