Many of the famous city's squares – some huge, majestic and often adorned with obelisks, some small and picturesque – took their present shape during the Renaissance and Baroque periods. The principal ones are Piazza Navona, the Spanish Steps, Campo de' Fiori, Piazza Venezia, Piazza Farnese, Piazza della Rotonda and Piazza della Minerva. One of the most emblematic examples of Baroque art is the Trevi Fountain by Nicola Salvi. Other notable 17th-century baroque palaces are the Palazzo Madama, now the seat of the Italian Senate, and the Palazzo Montecitorio, now the seat of the Chamber of Deputies of Italy.