San Silvestro al Quirinale

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.

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.

Santa Caterina a Magnanapoli is a baroque church dedicated to St. Catherine of Siena on Largo Magnanapoli on the slopes of the Quirinal Hill in Rome.

The Temple of Serapis on the Quirinal Hill in Rome was an sanctuary in Ancient Rome dedicated to the god Serapis and the goddess Isis.The temple was founded on an unknown date but known to have existed during the reign of Caracalla. It was known as the most monumental temple of the Quirinal Hill. In the 4th century, the temple was closed during the persecution of pagans in the late Roman Empire, after which it was torn down and used as building material.The gardens of the Palazzo Colonna contain what are believed to be the ruins of the Temple of Serapis.

The Palazzo Pallavicini-Rospigliosi is a palace in Rome, Italy. It was built by the Borghese family on the Quirinal Hill; its footprint occupies the site where the ruins of the baths of Constantine stood, whose remains still are part of the basement of the main building, the Casino dell'Aurora. Its first inhabitant was the famed art collector Cardinal Scipione Borghese, the nephew of Pope Paul V, who wanted to be housed near the large papal Palazzo Quirinale. The palace and garden of the Pallavicini-Rospigliosi were the product of the accumulated sites and were designed by Giovanni Vasanzio and Carlo Maderno in 1611–16. Scipione owned this site for less than a decade, 1610–16, and commissioned the construction and decoration of the casino and pergolata, facing the garden of Montecavallo. The Roman palace of this name should not be mistaken for the panoramic Villa Pallavicino on the shores of Lake Como in Lombardy.

Trajan's Market (Latin: Mercatus Traiani; Italian: Mercati di Traiano) is a large complex of ruins in the city of Rome, Italy, located on the Via dei Fori Imperiali, at the opposite end to the Colosseum. The surviving buildings and structures, built as an integral part of Trajan's Forum and nestled against the excavated flank of the Quirinal Hill, present a living model of life in the Roman capital and a glimpse at the restoration in the city, which reveals new treasures and insights about ancient Roman architecture.Thought to be the world's oldest shopping mall, the arcades in Trajan's Market are now believed by many to be administrative offices for Emperor Trajan. The shops and apartments were built in a multi-level structure and it is still possible to visit several of the levels. Highlights include delicate marble floors and the remains of a library.

The Pontifical University of Saint Thomas Aquinas (PUST), also known as the Angelicum in honor of its patron the Doctor Angelicus Thomas Aquinas, is a pontifical university located in the historic center of Rome, Italy. The Angelicum is administered by the Dominican Order and is the order's central locus of Thomist theology and philosophy. The Angelicum is coeducational and offers both undergraduate and graduate degrees in theology, philosophy, canon law, and social sciences, as well as certificates and diplomas in related areas. Courses are offered in Italian and for some programs in English. The Angelicum is staffed by clergy and laity and serves both religious and lay students from around the world.

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.

The Temple of Trajan was a Roman temple dedicated to the emperor Trajan and his wife Plotina after his deification by the Roman Senate. It was built in the Forum of Trajan (Rome), by Trajan's adoptive son and successor Hadrian, between 125 and 138. The architect was Apollodorus of Damascus. The temple was destroyed in the Middle Ages.

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.

Trajan's Forum (Latin: Forum Traiani; Italian: Foro di Traiano) was the last of the Imperial fora to be constructed in ancient Rome. The architect Apollodorus of Damascus oversaw its construction.

The Church of Santi Domenico e Sisto is one of the titular churches in Rome, Italy in the care of the Roman Catholic Order of Preachers, better known as the Dominicans. It is located at No. 1 Largo Angelicum on the Quirinal Hill on the campus of the Pontifical University of St. Thomas Aquinas (Angelicum), of which it is the University Church. As a titular church it has been held by Cardinal José Tolentino Mendonça since 5 October 2019.