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St. Olav's Cathedral (Norwegian: Sankt Olav domkirke) is the cathedral of the Roman Catholic Diocese of Oslo and the parish church of St. Olav's parish in Oslo, Norway. The cathedral has church services and masses in Norwegian and several other languages, including English and Polish.

The Roman Catholic Diocese of Oslo (Latin: Osloënsis) is an exempt diocese located in the city of Oslo in Norway.

Trinity Church (in Norwegian, Trefoldighetskirken), is a church in the Hammersborg neighborhood in central Oslo, Norway. Trinity Church is neighbor of the government buildings in Regjeringskvartalet. It is the parish church of the parish of Trinity, belonging to the Diocese of Oslo of the Church of Norway. It is one of the largest churches in Oslo (1000 seats). The church itself is in the raw red brick, while the vaults, arches and small columns have gray scale color. The nave is octagonal with a Greek cross superimposed, with the choir in the apse, shallow transept and rectangular entrance flanked by two slender, octagonal bell towers. A central dome rises above the church. Trinity Church is the largest church in Oslo and one of the largest of the many octagonal churches in Norway, but one of few octagonal churches constructed in red brick.

The National College of Art and Design (Norwegian: Statens håndverks- og kunstindustriskole) was established in 1818. In 1996 the National College of Art and Design became part of Oslo National Academy of the Arts (Kunsthøgskolen i Oslo, KHiO).

The Norwegian Museum of Decorative Arts and Design (Norwegian: Kunstindustrimuseet) is a museum in Oslo, Norway. Its collection includes clothing, textile, furniture, silver, glass, ceramics, and handicrafts. Since 2003, the museum has been administratively a part of the National Museum of Art, Architecture and Design (Nasjonalmuseet for kunst, arkitektur og design).

Akersgata (1-73E, 2-74) is a street in Oslo, Norway. It contains a number of important buildings such as the Parliament of Norway Building, several government buildings in the Regjeringskvartalet, the Trefoldighetskirken (Trinity Church), and the Centralteatret.

Johan Nygaardsvolds plass is a town square in Oslo, Norway. It is located between the offices of the Ministry of Finance, Høyblokka ("High Block"), and Y Block in Regjeringskvartalet. The square encompasses the Regjeringsparken ("The Government Park") with a water feature and an allée of trees. The square and park were designed by architect firm of Lunde & Løvseth. The square is named after Prime Minister Johan Nygaardsvold (1879-1952) who was Prime Minister in Norway from 20 March 1935 to 25 June 1945 as the leader of Nygaardsvold's Cabinet. No buildings have an address on this square.

St. Sunniva School (St. Sunniva skole) is an independent Roman Catholic school located in the centre of Oslo, Norway. The school was founded by the Sisters of St. Joseph from Chambéry in the Rhône-Alpes region in south-eastern France. Founded in 1865, it was part of an effort to restore Roman Catholicism in Norway. Queen Josephine, consort of Sweden and Norway, was an ardent supporter of the school. Her sister Queen Amélie, Empress of Brazil, also provided support.The school was owned and operated by the Sisters of St. Joseph for 140 years. Since 1 August 2005, it has been owned and operated by the Catholic Diocese of Oslo (Oslo Katolske Bispedømme). The school averages 540 students between the first and tenth grade.

The Y-Block was a building in Oslo, Norway, extant from 1970 to 2020. The building, designed in a Brutalist style by Erling Viksjø, was part of the Regjeringskvartalet (Government Quarter) in the centre of the city. It featured two murals by Pablo Picasso. It was one of few sites with murals designed by Picasso, along with the Château de Castille in France and the Col·legi d'Arquitectes de Catalunya in Barcelona.The building was damaged during the 2011 Norway attacks. In 2020, following intense public debate, the building's murals were removed and the remaining structure was demolished. The murals are planned to be incorporated into a replacement building.

The Borgarting Court of Appeal (Norwegian: Borgarting lagmannsrett) is one of six intermediate courts of appeal in the Kingdom of Norway. The Court is located in the city of Oslo. The court has jurisdiction over the counties of Oslo and western Viken. These areas constitute the Borgarting judicial district (Norwegian: Borgarting lagdømme). This court can rule on both civil and criminal cases that are appealed from one of its subordinate district courts. Court decisions can be, to a limited extent, appealed to the Supreme Court of Norway. The court has 62 judges and 45 administrative staff. The chief judicial officer of the court (Norwegian: førstelagmann) is currently Marianne Vollan. The court is administered by the Norwegian National Courts Administration.

The 22 July Centre (Norwegian: 22. juli-senteret) is a learning centre that works with the mediation of memory and knowledge about the terror attacks in Oslo and on Utøya on 22 July 2011.The Centre was opened on 22 July 2015, at the ground floor of the High-rise building in Regjeringskvartalet, and was temporarily moved to Teatergata 10 in 2020 due to renovation work in the Government building complex. The 22 July Centre is located at Teatergata 10, in the Government building complex in central Oslo. The permanent exhibition is titled The Public Conversation About 22 July. The exhibition contains a timeline of the terror attack that took place on 22 July 2011, as well as seven narratives about 22 July. With these narratives the Centre aims to broaden the conversation about 22 July today and in the years to follow. The centre is open every day except Mondays.

Centralteatret (English: Central Theater) is a theatre on Akersgata in the city centre of Oslo, Norway.Centralteatret was established by the husband and wife acting team of Johan Fahlstrøm and Alma Fahlstrøm in 1897. The theatre was especially known for a repertoire of the light genre including comedy, revues and operettas, but also classics (such as Ibsen) and new Norwegian drama.From 1902, Harald Otto (1865–1928) was the theater manager and owner. His son, Reidar Otto (1890–1959) subsequently ran it, while his son, Harald Otto joined as manager in 1938. Members of the Otto family ran the theater until 1959.Since 1959 the premises have been used partly as a television studio. Central theater is now renovated. The hall has 387 seats. Centralteatret is Norway's oldest theater site in operation.