Arch of Pietas

The Pantheon (UK: , US: ; Latin: Pantheum, from Greek Πάνθειον Pantheion, "[temple] of all the gods") is a former Roman temple and since 609 AD, a Catholic church (Basilica di Santa Maria ad Martyres or Basilica of St. Mary and the Martyrs), in Rome, Italy, on the site of an earlier temple commissioned by Marcus Agrippa during the reign of Augustus (27 BC – 14 AD). It was rebuilt by the emperor Hadrian and probably dedicated c. 126 AD. Its date of construction is uncertain, because Hadrian chose not to inscribe the new temple but rather to retain the inscription of Agrippa's older temple, which had burned down.The building is cylindrical with a portico of large granite Corinthian columns (eight in the first rank and two groups of four behind) under a pediment. A rectangular vestibule links the porch to the rotunda, which is under a coffered concrete dome, with a central opening (oculus) to the sky. Almost two thousand years after it was built, the Pantheon's dome is still the world's largest unreinforced concrete dome. The height to the oculus and the diameter of the interior circle are the same, 43 metres (142 ft).It is one of the best-preserved of all Ancient Roman buildings, in large part because it has been in continuous use throughout its history: since the 7th century, it has been a church dedicated to St. Mary and the Martyrs (Latin: Sancta Maria ad Martyres) but informally known as "Santa Maria Rotonda". The square in front of the Pantheon is called Piazza della Rotonda. The Pantheon is a state property, managed by Italy's Ministry of Cultural Heritage and Activities and Tourism through the Polo Museale del Lazio. In 2013, it was visited by over 6 million people. The Pantheon's large circular domed cella, with a conventional temple portico front, was unique in Roman architecture. Nevertheless, it became a standard exemplar when classical styles were revived, and has been copied many times by later architects.

The Basilica of Neptune (Latin: basilica Neptuni) was a basilica built in Rome by Marcus Vipsanius Agrippa in honour of Neptune and in celebration of his naval victories at Mylae, Naulochus and Actium.

Centro Storico is the first urban zone of Rome, identified by the initials 1A. It belongs to the Municipio I and it includes the main part of the city center.

The Fontana del Pantheon (English: Fountain of the Pantheon) was commissioned by Pope Gregory XIII and is located in the Piazza della Rotonda, Rome, in front of the Roman Pantheon. It was designed by Giacomo Della Porta in 1575 and sculpted out of marble by Leonardo Sormani.In 1711, Pope Clement XI requested that the fountain be modified and had Filippo Barigioni design a new layout, which included a different basin, made of stone, and the Macuteo obelisk, created during the period of Ramses II, set in the centre on a plinth with four dolphins decorating the base. In 1886, the original marble figures were removed, and replaced with copies by Luigi Amici. Today, the originals can be seen in the Museum of Rome. Fontana del Pantheon was the model to Francesco Robba for the Robba fountain, which stands at Town Square in Ljubljana, the capital of Slovenia. It is one of the city's most recognisable symbols.In April 2018 James Pallotta offered to donate €230,000 towards the restoration the fountain and also the fontana dei Leoni in Piazza del Popolo.

The Pontifical Ecclesiastical Academy (Latin: Pontificia Ecclesiastica Academia, Italian: Pontificia Accademia Ecclesiastica) is one of the Roman Colleges of the Catholic Church. The academy is dedicated to training priests to serve in the diplomatic corps and the Secretariat of State of the Holy See. Despite its name, the Pontifical Ecclesiastical Academy is not one of the ten Pontifical Academies of the Holy See. The patron of the Pontifical Ecclesiastical Academy is Saint Anthony the Great.

The Piazza della Rotonda is a piazza (city square) in Rome, Italy, on the south side of which is located the Pantheon. The square gets its name from the Pantheon's informal title as the church of Santa Maria Rotonda.

Piazza della Minerva is a piazza in Rome, Italy, near the Pantheon. Its name derives from the existence of a temple built on the site by Pompey dedicated to Minerva Calcidica, whose statue is now in the Vatican Museums.

The Campus Martius (Latin for the "Field of Mars", Italian Campo Marzio) was a publicly owned area of ancient Rome about 2 square kilometres (490 acres) in extent. In the Middle Ages, it was the most populous area of Rome. The IV rione of Rome, Campo Marzio, which covers a smaller section of the original area, bears the same name.

Elephant and Obelisk is a statue of an elephant carrying an obelisk, designed by the Italian artist Gian Lorenzo Bernini. It was unveiled in 1667 in the Piazza della Minerva in Rome, adjacent to the church of Santa Maria sopra Minerva, where it stands today.

The Baths of Nero (Thermae Neronis) or Baths of Alexander (Thermae Alexandrinae) were a complex of ancient Roman baths on the Campus Martius in Rome, built by Nero in either 62 or 64 and rebuilt by Alexander Severus in 227 or 229. It stood between the Pantheon and the Stadium of Domitian and were listed among the most notable buildings in the city by Roman authors and became a much-frequented venue. These thermae were the second large public baths built in Rome, after the Baths of Agrippa, and it was probably the first "imperial-type" complex of baths, with a monumental scale and symmetrical, axially-planned design. While in the sixteenth century the foundations of the caldarium were still visible, nothing else of the structure remains above ground except some fragments of walls incorporated into the structure of Palazzo Madama.

The Pontifical French Seminary (La. Pontificium Seminarium Gallicum, Fr.: Séminaire Pontifical Français, It. Pontificio Seminario Francese) is a Roman College dedicated to training French speaking Roman Catholic priests.

Sant'Eustachio [santeuˈstaːkjo] is a Roman Catholic titular church and minor basilica in Rome, named for the martyr Saint Eustace. It is located on Via di Sant'Eustachio in the rione Sant'Eustachio, a block west of the Pantheon and via della Rotonda, and a block east of Sant'Ivo alla Sapienza and the Via della Dogana Vecchia.