|Palace of St. Callixtus|
Palazzo di San Callisto (Italian)
|Town or city||Vatican City - Trastevere|
|Country||Extraterritorial Property of the Holy See in Rome|
|Coordinates||41°53′20″N12°28′14″E / 41.88889°N 12.47056°E|
|Current tenants||Dicasteries; Offices of the Roman Curia and of the diplomatic service of the Holy See; Catholic organizations; Residence of prelates and Roman Curia officials|
|Design and construction|
The Palazzo San Callisto (also known as the Palace of Saint Callixtus) is a Baroque palace in the Trastevere neighborhood of Rome and one of the extraterritorial Properties of the Holy See.  The original Palazzo is located in the Piazza di Santa Maria in Trastevere, the later extensions have their entrance in Piazza di San Callisto. The entire complex is one of the areas of the Holy See regulated by the 1929 Lateran Treaty signed with the Kingdom of Italy. As such it has extraterritorial status.
In the courtyard of the palace is the well where, according to tradition, Pope Callixtus I was martyred in the year 222. 
The palace was originally the residence of the titular cardinals of the Basilica of Santa Maria in Trastevere and was renovated in the 16th century under Cardinal Giovanni Morone by architect Orazio Torriani. Pope Paul V granted the palace to the monks of the Order of St. Benedict who had to leave their previous monastery due to an extension of the Quirinal Palace. The building took the name of the small adjacent church of San Callisto. Between 1610 and 1618 both the church and the convent were renovated. 
In 1936 during the pontificate of Pope Pius XI the architect Giuseppe Momo, known for the double helix staircase of the Vatican Museums, designed the construction of a new wing. 
One facade of the palace faces the celebrated Fountain in Piazza Santa Maria in Trastevere.
In 1990, the Palazzo was placed on the UNESCO World Heritage Register. 
It currently serves as home to:
Pope Callixtus I, also called Callistus I, was the bishop of Rome from c. 218 to his death c. 222 or 223. He lived during the reigns of the Roman emperors Elagabalus and Alexander Severus. Eusebius and the Liberian catalogue gave him five years of episcopate (217–222). In 217, when Callixtus followed Zephyrinus as Bishop of Rome, he started to admit into the Church converts from sects or schisms. He was martyred for his Christian faith and is venerated as a saint by the Catholic Church.
The properties of the Holy See are regulated by the 1929 Lateran Treaty signed with the Kingdom of Italy. Although part of Italian territory, some of them enjoy extraterritoriality similar to those of foreign embassies.
Trastevere is the 13th rione of Rome: it is identified by the initials R. XIII and it is located within Municipio I. Its name comes from Latin trans Tiberim, literally 'beyond the Tiber'.
The Basilica of Santa Maria in Trastevere ; English: Our Lady in Trastevere) is a titular minor basilica in the Trastevere district of Rome, and one of the oldest churches of Rome. The basic floor plan and wall structure of the church date back to the 340s, and much of the structure to 1140–43. The first sanctuary was built in 221 and 227 by Pope Callixtus I and later completed by Pope Julius I. The church has large areas of important mosaics from the late 13th century by Pietro Cavallini.
The Palazzo della Cancelleria is a Renaissance palace in Rome, Italy, situated between the present Corso Vittorio Emanuele II and the Campo de' Fiori, in the rione of Parione. It was built 1489–1513 by Baccio Pontelli and Antonio da Sangallo the Elder as a palace for Cardinal Raffaele Riario, Camerlengo of the Holy Roman Church, and is regarded as the earliest Renaissance palace in Rome. The Palazzo houses the Papal Chancellery, is an extraterritorial property of the Holy See, and is designated as a World Heritage Site.
Carlo Maderno (Maderna) was an Italian architect, born in today's Ticino, who is remembered as one of the fathers of Baroque architecture. His façades of Santa Susanna, St. Peter's Basilica and Sant'Andrea della Valle were of key importance in the evolution of the Italian Baroque. He is often referred to as the brother of sculptor Stefano Maderno, but this is not universally agreed upon.
Ponte is the 5th rione of Rome, identified by the initials R. V, and is located in Municipio I. Its name comes from Ponte Sant'Angelo, which connects Ponte with the rione of Borgo. This bridge was built by Emperor Hadrian in 134 AD to connect his mausoleum to the rest of the city. Though Pope Sixtus V changed the rione limits, so that the bridge belongs now to Borgo, not to Ponte anymore, the area has kept its name and a bridge as its coat of arms.
Campo Marzio is the 4th rione of Rome, identified by the initials R. IV. It belongs to the Municipio I and covers a smaller section of the area of the ancient Campus Martius. The logo of this rione is a silver crescent on a blue background.
Carlo Fontana was an Italian architect originating from today's Canton Ticino, who was in part responsible for the classicizing direction taken by Late Baroque Roman architecture.
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As of August 2022, there are a total of 1,154 World Heritage Sites located in 167 States Parties, of which 897 are cultural, 218 are natural and 39 are mixed properties. The countries have been divided by the World Heritage Committee into five geographic zones: Africa, Arab States, Asia and the Pacific, Europe and North America, and Latin America and the Caribbean. Italy, with 58 entries, has the highest number of World Heritage Sites. 27 state parties have no properties inscribed on the World Heritage List: Bahamas, Bhutan, Brunei, Burundi, Comoros, Cook Islands, Djibouti, Equatorial Guinea, Eswatini, Grenada, Guinea-Bissau, Guyana, Kuwait, Liberia, Maldives, Monaco, Niue, Rwanda, Saint Vincent and the Grenadines, Samoa, São Tomé and Príncipe, Sierra Leone, Somalia, South Sudan, Timor-Leste, Tonga, and Trinidad and Tobago.
Agostino Ciampelli was an Italian painter of the Baroque period. He trained with Santi di Tito in Florence, and painted in Rome under Clement VIII, including a Crucifixion for Santa Prassede and a Saint Giovanni Gualberto in its sacristy; Angels on the walls above the choirstalls in the apse of Santa Maria in Trastevere; frescoes of the Stoning of Saint Vitale in San Vitale and further frescoes in the little church of Santa Bibiena; and The Visitation in Sant Stefano di Pescia. At the Basilica of San Giovanni in Laterano, Ciampelli frescoed the walls of the canons' sacristy, the "Sala Clementina".
Orazio Torriani (1578-1657) was an architect and sculptor who worked in Rome.
Giambattista Spinola was a cardinal of the Catholic Church and an Archbishop of Genoa.
The culture of Rome in Italy refers to the arts, high culture, language, religion, politics, libraries, cuisine, architecture and fashion in Rome, Italy. Rome was supposedly founded in 753 BC and ever since has been the capital of the Roman Empire, one of the main centres of Christianity, the home of the Roman Catholic Church and the seat of the Italian Republic. Due to its historical and social importance, Rome has been nicknamed the Caput Mundi, or "capital of the world".
Giovanni Morone was an Italian cardinal. He was named Bishop of Modena in 1529 and was created Cardinal in 1542 by Pope Paul III. As a cardinal, he resided in the Vatican's Apostolic Palace and was consulted by Saint Ignatius, founder of the Jesuits.
The Palazzo Clemente della Rovere is a palace located in Piazza Rovere in the historical center of Genoa, Northwestern Italy. The palace was one of the 163 Palazzi dei Rolli of Genoa, the selected private residences where the notable guests of the Republic of Genoa were hosted during State visits. On 13 luglio 2006 it was added to the list of 42 palaces which now form the UNESCO World Heritage Site Genoa: Le Strade Nuove and the system of the Palazzi dei Rolli. The palace hosts today the General Consulate of Iceland.
The historic district of Rome was declared World Heritage Site by the United Nations Educational, Scientific and Cultural Organization in 1980. It covers 19,91 km² and is included in 22 rioni with 186.802 inhabitants. There are 25.000 importants archaeological sites and locations.
Coordinates: 41°53′21″N12°28′13″E / 41.8893°N 12.4702°E