Fontana delle Tartarughe

Palazzo Costaguti, also known as Palazzo Patrizi Costaguti, is a mannerist architecture Roman, located at the corner of Piazza Mattei with Via della Reginella, in rione Sant’Angelo in Rome. Large in size, it also runs along Via dei Falegnami and its rear facades are in Piazza Costaguti. Currently used as the seat of the Universitas Telematica Mercatorum.

Theatre of Balbus was an ancient Roman structure in the Campus Martius of Rome. It was built in 13 BC by proconsul Lucius Cornelius Balbus (minor), likely from the spoils of a military campaign by order of Augustus (Cassius Dio 54.18.2; Pliny the Elder, Natural History (Pliny) 36.59-60). Very little is mentioned of the theatre in ancient writings. Its location was debated for decades until pieces of the Forma Urbis were finally pieced together in the 1960s. Excavations of the theatre began in 1981 and are still ongoing, however, the main portion of the crypta finished in 2000. Today what has been excavated can be seen at the Museo Nazionale Romano Crypta Balbi (National Museum of Rome), which is located at Via delle Botteghe Oscure, 31, (corner of Via M. Caetani). The museum is located in what was the crypta or courtyard in the rear of the theater's complex behind the stage. This courtyard was the smallest of all of Rome's major theatres. Here patrons would stroll between acts of a performance and seek refreshment. A catalogue complied at the end of the 4th century recorded that the theatre's seating capacity was 11,510 persons.

Sant'Angelo is the 11th rione of Rome, Italy, located in Municipio I. Often written as rione XI - Sant'Angelo, it has a coat of arms with an angel on a red background, holding a palm branch in its left hand. In another version, the angel holds a sword in its right hand and a scale in its left.Sant'Angelo, the smallest of Rome's rioni, lies along the Tiber river east of Tiber Island. Rioni bordering this district, clockwise from north to south, include Regola, Sant'Eustachio, Pigna, Campitelli, and Ripa. Sant'Angelo's western border is the river. The rione's terrain is low and flat and, until the construction of the Lungotevere, particularly susceptible to flooding from the river. The historical significance of Sant'Angelo is mainly the result of the presence here of the Roman Ghetto.

The Palazzo Mattei di Giove is the most prominent among a group of Mattei houses that forms the insula Mattei in Rome, Italy, a block of buildings of many epochs.To distinguish this section from the others it carries the name of a Mattei fief, Giove. The Mattei owned a number of other palazzi that carried the family name including Palazzo Mattei di Trastevere across the Tiber as well as properties in Umbria, the Palazzo Mattei Paganica.

The Palazzo Caetani, also known as the Palazzo Mattei Caetani, and once known as the Palazzo of Alessandro Mattei or the Palazzo Mattei alle Botteghe Oscure, is an urban palace located on via delle Botteghe Oscure #32 in the rione Sant'Angelo of Rome, Italy. A palace at the site was initially commissioned from the architect Nanni di Baccio Bigio between 1545 and 1564 by Alessandro Mattei; this structure was purchased in 1776, by the Caetani, and has undergone numerous refurbishments. The building contains a number of tenants, including the Brazilian embassy to the Vatican, but also houses the Fondazione Camillo Caetani, including its library. The interior decoration was begun by Alessandro Mattei, who employed the brothers Taddeo and Federico Zuccari in painting some of the works in the piano nobile. Cristoforo Roncalli painted the palace chapel, and collaborated with Paul Bril, to decorate some of the rooms. The Caetani family employed Antonio Cavallucci in some of the 18th-century decorations.

Santa Caterina dei Funari is a church in Rome in Italy, in the rione of Sant'Angelo. The church is mainly known for its façade and its interior with frescoes and paintings.

Sant'Ambrogio della Massima (also Sant'Ambrogio alla Massima) is a Roman Catholic church in rione Sant'Angelo, Rome, Italy, that perhaps dates to the 4th century. It was a convent until it became the subject of a Vatican investigation in the 19th century, when it was disbanded and repurposed as a missionary college and later an abbey church. It is said to have been associated with Saint Ambrose.

The Circus Flaminius was a large, circular area in ancient Rome, located in the southern end of the Campus Martius near the Tiber River. It contained a small race-track used for obscure games, and various other buildings and monuments. It was "built", or sectioned off, by Gaius Flaminius in 221 BC. After Augustus divided the city into 14 administrative regions, the Circus Flaminius gave its name to Regio IX, which encompassed the Circus and all of the Campus Martius west of the Via Lata.

Santa Maria in Publicolis is a Baroque church in Rome. It is located in the rione of Sant'Eustachio. The facade was designed by Giovan Antonio de' Rossi.

The Temple of Mars (Latin: Aedes Martis in Circo) was a temple built on the campus Martius in Rome in the 2nd century BC, near the Circus Flaminius, dedicated to Mars. The consul Decimus Junius Brutus Callaicus vowed a temple to Mars in 138 BC and construction began after 135 BC, financed by booty from his campaign in Hispania. It was designed by Hermodorus of Salamis and was dedicated in 132 BC during Junius' triumph. It was restored in the late Republic, retaining its original plan and features. If still in use by the 4th-century, the temple would have been closed during the persecution of pagans in the late Roman Empire, when the Christian Emperors issued edicts prohibiting non-Christian worship.

The Roman Ghetto or Ghetto of Rome (Italian: Ghetto di Roma) was a Jewish ghetto established in 1555 in the Rione Sant'Angelo, in Rome, Italy, in the area surrounded by present-day Via del Portico d'Ottavia, Lungotevere dei Cenci, Via del Progresso and Via di Santa Maria del Pianto, close to the River Tiber and the Theatre of Marcellus. With the exception of brief periods under Napoleon from 1808 to 1815 and under the Roman Republics of 1798–99 and 1849, the ghetto of Rome was controlled by the papacy until the capture of Rome in 1870.

Largo di Torre Argentina is a square in Rome, Italy, with four Roman Republican temples and the remains of Pompey's Theatre. It is in the ancient Campus Martius.The name of the square comes from the Torre Argentina, which takes its name from the city of Strasbourg whose Latin name was Argentoratum. In 1503, the Papal Master of Ceremonies Johannes Burckardt, who came from Strasbourg and was known as "Argentinus", built in via del Sudario a palace (now at number 44), called Casa del Burcardo, to which the tower is annexed. Julius Caesar was assassinated in the Curia of Pompey, and the spot where he is believed to have been assassinated is in the square.After Italian unification, it was decided to reconstruct part of Rome (1909), demolishing the zone of Torre Argentina. However, during the demolition work in 1927, the colossal head and arms of a marble statue were discovered. The archaeological investigation brought to light the presence of a holy area, dating to the Republican era, with four temples and part of Pompey's Theatre. In 2019, Rome's mayor Virginia Raggi announced that walkways would be installed in the site allowing the general public to tour the ruins for the first time.