The Quirinal Hill is today identified with the Palazzo del Quirinale, the official residence of the President of the Italian Republic and one of the symbols of the State. Before the abolition of the Italian monarchy in 1946, it was the residence of the king of Italy, and before 1871 it was, as originally, a residence of the Pope.
The healthy cool air of the Quirinal Hill attracted aristocrats and papal families that built villas where the gardens of Sallust had been in antiquity. A visit to the villa of Cardinal Luigi d'Este in 1573 convinced Pope Gregory XIII to start the building of a summer residence the following year, in an area considered healthier than the Vatican Hill or Lateran: His architects were Flaminio Ponzio and Ottaviano Nonni, called Mascherino; under Pope Sixtus V, works were continued by Domenico Fontana (the main facade on the Piazza) and Carlo Maderno, and by Gian Lorenzo Bernini for Pope Clement XII. Gardens were conceived by Maderno. In the 18th century, Ferdinando Fuga built the long wing called the Manica Lunga, which stretched 360 meters along via del Quirinale. In front lies the sloping Piazza del Quirinale where the pair of gigantic Roman marble "Horse Tamers" representing Castor and Pollux, found in the Baths of Constantine, were re-erected in 1588. In Piranesi's view, the vast open space is unpaved. The Palazzo del Quirinale was the residence of the popes until 1870, though Napoleon deported both Pius VI and Pius VII to France, and declared the Quirinale an imperial palace. When Rome was united to the Kingdom of Italy, the Quirinale became the residence of the kings until 1946.
Today, the Palazzo hosts the offices and the apartments of the Head of State and, in its long side along via XX Settembre (the so-called Manica Lunga), the apartments that were furnished for each visit of foreign monarchs or dignitaries.
Several collections are in this Palazzo, including tapestries, paintings, statues, old carriages (carrozze), watches, furniture, and porcelain.
In Piranesi's view, the palazzo on the right is the Palazzo della Sacra Consulta, originally a villa built upon the ruins of the Baths of Constantine, which was adapted by Sixtus V as a civil and criminal court. The present façade was built in 1732–1734 by the architect Ferdinando Fuga on the orders of Pope Clement XII Corsini, whose coat-of-arms, trumpeted by two Fames, still surmounts the roofline balustrade, as in Piranesi's view. It formerly housed Mussolini's ministry of colonial affairs.
Read more about this topic: Quirinal Hill