The pasajes or alleyways in Buenos Aires are beautiful and fun to find for beautiful street art or architecture, depending on the neighborhood. Pasaje Dr. Rodolfo Rivarola is unique, at just one block long in the heart of San Nicolas downtown, the buildings are perfect mirrors of the one across the street. The buildings are well preserved and this is a beautiful pasaje downtown. It's worth a short detour if you are on Avenida de Mayo or near Congress.