An intricately detailed, 19th century building spanning the width and length of a block in Balvanera, the Palace of Running Water must be the world's most impressive clean water pumping facility. I can't imagine it even has a competitor.
Before we began our exploration of Once, we spent some time walking around the southern end of Balvanera, and happened upon the Basilica Santa Rosa de Lima, on Avenido Belgrano. Built in the Roman-Byzantine style in 1926, this church is most impressive for its mammoth cupola. Santa Rosa was a Peruvian catholic from the 16th century, who would become South America's first saint. She died a virgin at the age of 31, after having predicted the exact date of her death.