One of many ornate early 20th-century buildings on the avenue (©Javarman3/iStock/Thinkstock)
This huge, monumental Greco-Roman building, in white marble and topped with a green dome, houses the seat of the legislature. Completed in 1906, it was modelled on Washington’s Capitol Building. This is one of many buildings on Avenida de Mayo with examples of fine early 20th-century architecture. Daily guided tours in English; passport essential.