Column of the Immaculate Conception, Piazza Mignanelli, Rome.

Column of the Immaculate Conception located in what is called Piazza Mignanelli, towards the south east extension of Piazza di Spagna, Rome,
The Column of the Immaculate Conception or la Colonna della Immacolata, is a nineteenth-century monument in central Rome depicting the Blessed Virgin Mary, located in what is called Piazza Mignanelli, towards the south east extension of Piazza di Spagna. It was placed aptly in front of the offices of the Palazzo di Propaganda Fide (offices for promulgating the faith), now renamed the Congregation for the Evangelization of Peoples.
The Marian monument was designed by the architect Luigi Poletti, the actual figure atop was sculpted by Giuseppe Obici and commissioned by Ferdinand II, King of the Two Sicilies. In part, he wanted to put closure to the dispute between Naples and the Papal States that had developed in the last century, when Naples abolished the Chinea, a yearly tribute offered to the Pope as ultimate sovereign of Naples.
The Corinthian column itself was sculpted in ancient Rome, and was discovered in 1777 during the construction of the monastery of Santa Maria della Concezione located in this area, the site of the former Campus Martius. The original column once bore the goddess Minerva carrying a shield, now lost in history.

more on https://en.wikipedia.org/wiki/Column_of_the_Immaculate_Conception,_Rome