Temple of Serapis (Quirinal Hill)

Palazzo Mengarini is a 19th-century palazzo in via XXIV maggio in Rome. The palace is named after a 19th-century Senator during the Kingdom of Italy, Guglielmo Mengarini. The Senator commissioned the palace design from the architect Gaetano Koch. Mengarini's wife, the German chemist Margarete Traube, animated a lively salon at this palace, hosting Theodor Mommsen, Emanuel Löwy, Pietro Blaserna, Adolf Furtwängler, as well as her brother Ludwig Traube. It subsequently became property of Senator Luigi Albertini, director of Corriere della Sera, and after 1941, of his daughter Elena née Carandini.

The Pontifical Gregorian University (Italian: Pontificia Università Gregoriana; also known as the Gregorian or Gregoriana) is a higher education ecclesiastical school (pontifical university) located in Rome, Italy. The Gregorian originated as a part of the Roman College, founded in 1551 by Ignatius of Loyola, and included all grades of schooling. Its chairs of philosophy and theology received given Papal approval in 1556, making it the first institution founded by the Society of Jesus (Jesuits). In 1584, the Roman College was given a new home by Pope Gregory XIII, after whom it was renamed the Gregorian University. It had distinguished scholars in ecclesiastical fields as well as in natural science and mathematics. Only the theology and philosophy departments of the Gregorian survived the political turmoil in Italy after 1870. Today, the Gregorian has an international faculty and around 2,750 students from over 150 countries.

The Kircherian Museum was a public collection of antiquities and curiosities, a Wunderkammer, founded in 1651 by the Jesuit father Athanasius Kircher in the Roman College. Considered the first museum in the world, its collections were gradually dispersed over the centuries.

The Palazzo Colonna (Italian pronunciation: [paˈlattso koˈlonna, - koˈlɔnna]) is a palatial block of buildings in central Rome, Italy, at the base of the Quirinal Hill, and adjacent to the church of Santi Apostoli. It is built in part over the ruins of an old Roman serapeum, and it has belonged to the prominent Colonna family for over twenty generations.

San Silvestro al Quirinale (or St. Sylvester on Quirinal Hill) is a historic church in central Rome, Italy. It is located near Via XXIV Maggio corner with Via Mazzarino, a few blocks south of the Piazza del Quirinale.

The Fontana dei Dioscuri is the fountain set opposite the Palazzo del Quirinale, the official residence of the President of the Italian Republic in the Piazza del Quirinale. The original fountain, which no longer exists, commissioned by Pope Sixtus V in 1588, had the Dioscuri, Castor and Pollux statues, from Constantine I of Rome's Baths, moved to the piazza, from the site, thought to have been nearby, flanking it. In the late 1780s by Antinori, was commissioned by Pope Pius VI, to make a better layout for the piazza and had the fountain and the Dioscuri moved, and included the large Obelisk which had been moved from the Campus Martius in the design. Some time between, that original fountain was lost, and, in 1818 a new one, which can be seen today, was commissioned by Pope Pius VII and was designed by Raffaele Stern using an ancient granite Roman shell that had been found in the 16th century supported on top of a large basin. It was sited in front of the two statues with the obelisk between them. In 1810, the Rome-based sculptor Paolo Triscornia sent the reduced copies of the Dioscuri to Saint Petersburg for his compatriot Giacomo Quarenghi. They were put up in front of the Saint Petersburg Manege six years later.

Santa Croce e San Bonaventura alla Pilotta or Santa Croce e di San Bonaventura dei Lucchesi is a church in Rome, sited on via dei Lucchesi in the Trevi district, between the Trevi Fountain and the Pontificia Università Gregoriana. It is Lucca's regional church in Rome.

Palazzo Muti Papazzurri is a Baroque palazzo in Rome, Italy. It was built in 1660 by the architect Mattia de' Rossi, a pupil of Gian Lorenzo Bernini. It is thought it was constructed for the newly married Pompeo Muti Papazzurri and Maria Isabella Massimo. A print of 1699 shows a large townhouse built around an open cour d'honneur, the court being entered through a triumphal arch at the centre of a Baroque screen linking the two flanking wings. The screen still remains but has today had rooms built above it, thus completely altering the open appearance of the palazzo to a plain closed façade. During the 18th century the palazzo formed the centre of a family complex of properties which were rented in their entirety to the Stuarts, pretenders to the British throne; thus for a time the palazzo was the home of a court in exile.In 1909 the palazzo was heavily restored which has changed de' Rossi's architectural concept of the original design by removing the pediments to the windows and the statuary decorating the roofline. The 17th and 18th century interior decoration of the palazzo has been preserved complete with their frescoed ceilings. The gallery, one of the principal reception rooms, has frescos depicting scenes from classical mythology attributed to Giovanni Francesco Grimaldi and Niccolò Berrettoni. Grimaldi was one of the most fashionable painters of his day having worked extensively for Cardinal Mazarin. Today the palazzo houses the Pontifical Biblical Institute.

Baths of Constantine (Latin, Thermae Constantinianae) was a public bathing complex built on the Quirinal Hill in Rome by Constantine I, probably before 315.Ancient Constantinople and Arles also had complexes known as Baths of Constantine.

The Forum Suarium was the pork forum venalium of ancient Rome during the empire, mentioned first in two inscriptions dating c. AD 200. This market was near the barracks of the cohortes urbanae in the northern part of the Campus Martius, probably close to the present Via di Propaganda, and its administration was in the hands of the prefect or of one of his officers.

The Pontifical Biblical Institute (also known as Biblicum) is a research and postgraduate teaching institution specialised in biblical and ancient Near Eastern studies. It is an institution of the Holy See entrusted to the Society of Jesus.

The Palazzo della Consulta (built 1732–1737) is a late Baroque palace in central Rome, Italy, that since 1955 houses the Constitutional Court of the Italian Republic. It sits across the Piazza del Quirinale from the official residence of the President of the Italian Republic, the Quirinal Palace.