Piazza del Popolo (c1820). Piazza del Popolo is a large urban square in Rome. The name in modern Italian literally means People's Square, but historically it derives from the poplars after which the church of Santa Maria del Popolo, in the northeast corner of the piazza, takes its name. The piazza lies inside the northern gate in the Aurelian Walls, once the Porta Flaminia of ancient Rome, and now called the Porta del Popolo. This was the starting point of the Via Flaminia, the road to Ariminum and the most important route to the north. At the same time, before the age of railroads, it was the traveller's first view of Rome upon arrival. For centuries, the Piazza del Popolo was a place for public executions, the last of which took place in 1826. The layout of the piazza today was designed in neoclassical style between 1811 and 1822 by the architect Giuseppe Valadier, He removed a modest fountain by Giacomo Della Porta, erected in 1572, and demolished some insignificant buildings and haphazard high screening walls to form two semicircles, reminiscent of Bernini's plan for St. Peter's Square, replacing the original cramped trapezoidal square centred on the Via Flaminia. Valadier's Piazza del Popolo, however, incorporated the verdure of trees as an essential element; he conceived his space in a third dimension, expressed in the building of the viale that leads up to the balustraded overlook from the Pincio. An Egyptian obelisk of Sety I from Heliopolis stands in the centre of the Piazza. Three sides of the obelisk were carved during the reign of Sety I and the fourth side, under Rameses II. The obelisk, known as the Flaminio Obelisk or the Popolo Obelisk, is the second oldest and one of the tallest obelisks in Rome. The obelisk was brought to Rome in 10 BC by order of Augustus and originally set up in the Circus Maximus. It was re-erected here in the piazza by the architect-engineer Domenico Fontana in 1589 as part of the urban plan of Sixtus V. The piazza also formerly contained a central fountain, which was moved to the Piazza Nicosia in 1818, when fountains, in the form of Egyptian-style lions, were added around the base of the obelisk. Looking from the north, three streets branch out from the piazza into the city, forming the so-called trident: the Via del Corso in the centre; the Via del Babuino to the left and the Via di Ripetta to the right. The twin churches of Santa Maria dei Miracoli and Santa Maria in Montesanto, begun by Carlo Rainaldi and completed by Bernini and Carlo Fontana, define the junctions of the roads. Close scrutiny of the twin churches reveals that they are not mere copies of one another, as they would have been in a Neoclassical project, but vary in their details, offering variety within their symmetrical balance in Baroque fashion. The central street, now known as the Via del Corso, was the ancient Via Lata, and to the north it links with the ancient Roman road, the Via Flaminia, beyond the city gate and southwards, to the Piazza Venezia, the Capitol and the forum. The Via di Ripetta leads past the Mausoleum of Augustus to the River Tiber, where the Baroque riverside landing called the Porto di Ripetta was located until it was destroyed in the late 19th century. The Via del Babuino, linking to Piazza di Spagna, takes its name from a grotesque sculpture of Silenus that gained the popular name of the Baboon. To the north of the piazza stands the Porta del Popolo, beyond which lies the Piazzale Flaminio and the start of the Via Flaminia. The gateway was reworked to give its current appearance by Bernini for Pope Alexander VII in 1655, to welcome Queen Christina of Sweden to Rome following her conversion to Roman Catholicism and her abdication. Opposite Santa Maria del Popolo stands a Carabinieri station, with a dome reflecting that of the church. In his urbanistic project, Valadier constructed the matching palazzi that provide a frame for the scenography of the twin churches and hold down two corners of his composition. He positioned a third palazzo to face these and matched a low structure screening the flank of Santa Maria del Popolo, with its fine Early Renaissance facade, together holding down the two northern corners. Valadier outlined this newly defined oval forecourt to the city of Rome with identical sweeps of wall, forming curving exedra-like spaces. Behind the western one, a screen of trees masks the unassorted fronts of buildings beyond. The aqueduct carrying the Acqua Vergine Nuovo was completed in the 1820s, and its water provided the opportunity for fountains and their basins that offered the usual public water supply for the rione or urban district.