Roman Catholic Diocese of Koper

Gravisi–Barbabianca Mansion (Slovene: palača Gravisi-Barbabianca; Italian: palazzo Gravisi-Barbabianca) is a Baroque mansion in Koper (Italian: Capodistria), a port town in southwestern Slovenia. It was built in 1710. It was the family seat of the Gravisi family, who held the title of the Marquis of Pietrapelosa. Today it is the home of a music school.

The Cathedral of the Assumption of the Blessed Virgin Mary (Slovene: Stolna cerkev Marijinega vnebovzetja) also called Koper Cathedral is the Catholic cathedral of the Diocese of Koper, in the city of Koper, Slovenia.The church was built in the second half of the twelfth century in Romanesque style, with three naves, each ending with an apse. Until 1392 the church underwent changes and additions, which also led to a change of style: the western facade is clearly Gothic. After an earthquake in 1460, the facade was redesigned in 1488, with the addition of Renaissance elements. The tower, which offers views of the city and the bay, is four stories, follows the style of an Italian bell tower and houses one of the oldest bells in Slovenia, dating back to 1333. Early 18th century, Koper was under Venetian influence, and was again an architectural transformation in the Baroque style. Under the direction of Giorgio Massari, additional landscaping elements were added to the church, including valuable paintings of Venetian painters Pietro Liberi, Celesti Andrea, Antonio Zanchi and Vittore Carpaccio. The most important painting is the Holy Conversation of Vittore Carpaccio, dating from 1516.

Assumption of Mary Parish Church in Dekani (Slovene: župnijska cerkev Marijinega vnebovzetja v Dekanih) is the parish church of the Parish of Dekani, a village near the city of Koper in southwest Slovenia. It was built in 1229, rebuilt towards the end of the 15th century, consecrated in 1493, and restored and enlarged in 1902.

Brutti Mansion (Slovene: palača Brutti; Italian: palazzo Brutti) is a mansion in Koper, a port town in southwestern Slovenia. It was built in the late-Baroque style in 1714 according to plans by the architect Giorgio Massari, at the request of Count Barnabi Brutti. It houses the central library of Koper, named after the librarian and politician Srečko Vilhar.

The Praetorian Palace (Slovene: Pretorska palača, Italian: palazzo Pretorio) is a 15th-century Venetian Gothic palace in the city of Koper, in southwest Slovenia. Located on the southern side of the city's central Tito Square (at Titov trg/piazza Tito 3), it houses the Koper city government and a wedding hall. It is considered one of the city's architectural landmarks.

Gravisi–Buttorai Mansion (Slovene: palača Gravisi-Buttorai; Italian: palazzo Gravisi-Buttorai) is a mansion in Koper, a port town in southwestern Slovenia. It is a protected monument of local significance. The mansion is situated at Shoemaker's Street (Slovene: Čevljarska ulica, Italian: Calegaria) in the old town center. It was the seat of a branch of the Gravisi family, whose senior line had the title of Marquis of Pietrapelosa, first granted to Nicolò Gravisi in 1440.

The Loggia Palace (Italian: palazzo della Loggia) is a Venetian Gothic palace in Koper, a port town in southwestern Slovenia. It is the only preserved Gothic town hall in Slovenia.

University of Primorska (Slovenian Univerza na Primorskem, Italian Università del Litorale) is a public university in Slovenia. It is located in Koper, Izola, and Portorož and is named for the Slovenian Littoral region, where it is located.

The Carli Mansion (Slovene: palača Carli; Italian: palazzo Carli) is a mansion in Koper, a port town in southwestern Slovenia. It is named after the family of the historian and encyclopedist Gian Rinaldo Carli, who was born in it in 1720. It is an example of the Baroque architecture, with a balcony in the piano nobile, decorated with a three-mullioned window. Its inner court, decorated with frescoes, has a fountain from 1418.

The Da Ponte Fountain (Slovene: Da Pontejev vodnjak; Italian: fontana Da Ponte) is a fountain in the city of Koper, in southwestern Slovenia. It is located at Prešeren Square (Italian: piazza Prešeren), formerly known as Muda Square.

Almerigogna Mansion (Slovene: palača Almerigogna; Italian: palazzo Almerigogna) is a mansion in Koper, a port town in south-western Slovenia. It is one of the most significant Gothic monuments in the town.

St. Bassus's Church (Slovene: cerkev svetega Basa; Italian: chiesa di San Basso) is a church on Prešeren Square (Prešernov trg; Italian: piazza Prešeren) in Koper, a port town in southwestern Slovenia. It has the function of a chapel of the Parish of Koper–Assumption of Mary (the cathedral parish). The building, which dates from the end of the 16th century, at first served as a hospital of St. Nazarius and was consecrated as a church by Koper Bishop Paolo Naldini in 1706. It was significantly rebuilt in 1731. It has a Baroque interior with a single nave and a flat ceiling. The rich Baroque interior furnishings include the main altar with images of St. Nazarius and St. Bassus, a statue of St. Bassus in the vestry, and a Romanesque crucifix from about 1120, later Gothicised, that was believed to have miraculous powers (Italian: Crocifisso miracoloso). It is made of polychrome wood and depicts a triumphant Christ.