Viale XX Settembre (formerly Via dell'Acquedotto) is one of the main pedestrian arteries of the city of Trieste. It extends for over a kilometer and is distributed over four of the seven historical districts of Trieste (ie the districts of Cologna, Borgo Teresiano, San Giovanni and Chiadino). The first part is completely pedestrianized while in the second part cars can move. The avenue owes its name to the Breccia di Porta Pia, which occurred precisely on 20 September 1870. In the past, the road was known as Via dell'Acquedotto, as the city aqueduct still passes through the cement. The boulevard is a great place for recreation for young people, and offers numerous attractions. For example, during the period of San Niccolò or for Carnival, stalls are set up. In these times of the year the street is crowded with people.