The main feature is that of being deprived of the fourth side in the second half of the 19th century, due to the demolition of Chiesanuova. The square, formerly the Roman pass via Emilia (187 BC), has a roughly rectangular shape. Its architectural feature is the contrast between the imposing Palazzo Comunale (Albornoz Palace) and the Venetian loggia and much more reduced dimensions of the structures opposing neoclassical and eclectic. In past centuries the square has also been called lower square, piazza Maggiore and piazza Vittorio Emanuele.
At the center of the square stands the fontana Masini. The fountain was made of Istria stone, is high on three steps on the piazza del Popolo; each façade is decorated with a pair of fluted pilasters supporting a curvilinear tympanum fratto, inside of which is placed a heraldic Crest: the northern side belongs to Pope Sixtus V and is superimposed on the name of the city; the others are the Cardinal Legate Guido Ferreri, vice legate Antonio Maria Galli and the Cardinal Legate Domenico Pinelli. Four volute erma corners are surmounted by Tritons blowing water throwing in a waterspout.