Porta Capena

San Gregorio Magno al Celio, also known as San Gregorio al Celio or simply San Gregorio, is a church in Rome, Italy, which is part of a monastery of monks of the Camaldolese branch of the Benedictine Order. On March 10, 2012, the 1,000th anniversary of the founding of the Camaldolese in 1012 was celebrated here at a Vespers service attended by Anglican and Catholic prelates and jointly led by Pope Benedict XVI and Rowan Williams, Archbishop of Canterbury. San Gregorio is located on the Caelian Hill, in front of the Palatine. Next to the basilica and monastery is a convent of nuns and a homeless shelter run by Mother Teresa of Calcutta's congregation, the Missionaries of Charity.

The Septizodium (also called Septizonium or Septicodium) was a building in ancient Rome. It was built in 203 AD by Emperor Septimius Severus. The origin of the name "Septizodium" is from Septisolium, from the Latin for temple of seven suns, and was probably named for the seven planetary deities (Saturn, Sun, Moon, Mars, Mercury, Jupiter, Venus) or for the fact that it was originally divided into seven parts. The building had no known practical purpose and was probably meant to be a decorative façade, known as a Nymphaeum. Ancient and medieval sources describe its purpose as being intended to impress Severus' fellow north Africans as they entered the city, as it was located at the place where the Via Appia passes the Palatine and leads east towards the Forum Romanum. Other examples of septizodia are known, all from Africa.Ammianus Marcellinus refers to the building in an ambiguous passage: "The plebs...had come together at the Septemzodium, a popular place, where Marcus Aurelius built a Nymphaeum in a rather ostentatious style."By the 8th century, the edifice was already ruined and had been incorporated in one of the numerous baronial fortresses of the medieval city, held in the 12th-13th century by the Frangipani family. In August 1241, after the death of Pope Gregory IX, the 11 cardinals who were able to get into Rome through the lines of Emperor Frederick II's army came together in the ramshackle palace of the Septizodium. The two-month-long election was arduous, not only because of the deep political crisis but the physical hardships. There was a frightful heat and the rain leaked through the roof of the chamber of the cardinals, mingled with the urine of Matteo Rosso Orsini's guards on the rooftiles. One of the cardinals fell ill and died. The new pope, Celestine IV, was also very worn out, and died 16 days after his election. In 1588, during the reign of Pope Sixtus V, the eastern facade of the building was demolished under the direction of Domenico Fontana. The stones obtained were used for the basement of the Flaminio Obelisk of Piazza del Popolo, the restoration of the Column of Marcus Aurelius, the pope's tomb in St. Mary Major and other structures.

The lesser-known Arch of Titus was a triple bay arch erected at the eastern end of the Circus Maximus by the Senate in A.D. 81, in honour of Titus and his capture of Jerusalem in the First Jewish–Roman War. Few traces remain. The inscription (CIL 19151=ILS 264), quoted by an 8th-century Swiss monk known only as the "Einsiedeln Anonymous", makes it clear that this was Titus' triumphal arch. Sculptural fragments of a military frieze have been attributed to the arch.Architectural and epigraphic fragments of the now lost arch were rediscovered during excavations in 2015.

The FAO Building (Italian: Palazzo FAO, literally "FAO Palace") is the international headquarters of the Food and Agriculture Organization (FAO), located in the San Saba rione of Rome, Italy. Originally built under the Fascist government of Italy in the 1930s to be the seat of the Ministry of Italian Africa, the building was repurposed after World War II to be the headquarters of the then-new United Nations' agricultural agency, the FAO. The building is located the in one of the most scenic parts of Rome, southeast of the Aventine Hill, and overlooking the Baths of Caracalla and the Circus Maximus.

Circo Massimo is a station on Line B of the Rome Metro. It was opened on 10 February 1955 and is sited at the east end of the Circus Maximus, after which it is named, near the headquarters of the FAO, originally built as the Ministero delle Colonie. Until 2002 the Obelisk of Axum also stood near the station. It has two separate exits on either side of the viale Aventino.

The David Lubin Memorial Library is the main library of the Food and Agriculture Organization of the United Nations (FAO). Its world-renowned collection consists of technical material related to food, nutrition, agriculture, forestry and fisheries, with emphasis on developing countries. The core of its historical collection is the library of the International Institute of Agriculture (IIA), whose assets were entrusted to FAO when the IIA was disbanded in 1946.

The Castra Peregrina ("camp of the strangers") was a castrum (a military barracks) in Rome situated on the Caelian Hill. It was occupied by various military units during the later part of the Roman Empire.

The Villa Celimontana (previously known as Villa Mattei) is a villa on the Caelian Hill in Rome, best known for its gardens. Its grounds cover most of the valley between the Aventine Hill and the Caelian.

Santa Balbina is a Roman Catholic basilica church in located in the Aventine rione, adjacent to the Baths of Caracalla in Rome.

The Domus Severiana is the modern name given to the final extension to the imperial palaces on the Palatine Hill in Rome, built to the south-east of the Stadium Palatinum in the Domus Augustana of Septimius Severus. It included the Baths of Septimius Severus (Latin: Balneum Palatii). All that remains of the building are the imposing brick substructures at the corner of the hill, which created an artificial platform at the same level as the palace of Domitian, extending it, since the emperors had run out of space on the hill. There are very few remains of the building itself, which was then built on the terrace under the substructures. It had a view of Rome from the Circus Maximus and the Aventine Hill to the Caelian Hill and the Baths of Caracalla. They were part of an imperial baths complex or thermae, now visible in the remains below the exedra of the Stadium Palatinum, which may have been built under Domitian and which was rebuilt by Maxentius. They were fed by a branch of the Aqua Claudia, which spanned the valley between the Palatine Hill and the Caelian Hill and whose arches are still visible. On the side facing the via Appia, Septimius Severus commissioned an impressive three-level facade akin to the scaenae frons in a theatre, with fountains and colonnades. This became known as the Septizodium. It is said that the emperor monumentalised this side of the building to impress his fellow Africans, who would arrive in Rome along the via Appia. The Septizodium's remains were demolished in the 16th century and it is only known from Renaissance drawings.

The Temple of Claudius (Latin: Templum Divi Claudii), also variously known as the Temple of the Divus Claudius, the Temple of the Divine Claudius, the Temple of the Deified Claudius, or in an abbreviated form as the Claudium, was an ancient structure that covered a large area of the Caelian Hill in Rome, Italy. It housed the Imperial cult of the Emperor Claudius, who was deified after his death in 54 AD.

The church of San Tommaso in Formis is a small church in Rome, situated on the Caelian Hill.