What is the oldest building in Oslo?
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To the southeast of the park is Oslo’s oldest building – Aker Kirke, built around 1100, but restored from ruins around 1860, and then again in the 1950s in a more authentic style. Next to the church is the cemetery Vår Frelsers gravlund, created in 1808 as a result of the great famine and cholera epidemic of the Napoleonic Wars. The nearby area around Damstredet and Telthusbakken is interesting since it retains the small town character of Oslo in the first part of the 19th century.
St. Hanshaugen
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Old Aker Church () is a medieval era church located in Oslo, Norway. An active parish, the church is the oldest existing building in Oslo. The church is surrounded by Old Aker Cemetery.
Old Aker Church
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Old Aker Church was built as a three-naved Romanesque style basilica and constructed from limestone. It is believed to have been erected by King Olav Kyrre in 1080 as a church for all of Vingulmark, the historic area surrounding Oslo. The grounds of Old Aker Church were originally likely the former site of the regional thing during the pre-Christian period.
Old Aker Church
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The church was built over the former site of the Akerberg mines ("Akersberg gruve"), an ancient silver mine which was in use since the early Viking era. The mines are mentioned in the 1170 "Historia Norvegiae". The existence of these former mines must have been the inspiration for a number of local stories about the church having hidden silver treasures and even dungeons with dragons.
Old Aker Cemetery () is the cemetery of Old Aker Church. Like the church, the cemetery dates back to the Middle Ages. The cemetery is located adjacent to the newer Cemetery of Our Saviour, which was established in 1808. Several notable people are interred in the cemetery.
Old Aker Church
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Gamle rådhus (English: The Old Town Hall) is a building with a long history in Oslo, Norway. It is one of the oldest buildings in the Norwegian capital. It was built as the first town hall in Christiania (a former name of the City of Oslo, not to be confused with the Old Town, Oslo) in 1641. The construction of the town hall got financial support by King Christian IV. The building has historically been used for many purposes. A restaurant was appointed in a side wing in 1856 and moved to the main house in 1925. From 1980 to 2010 a theatre museum was located in the side wing of the first floor. The Old Town Hall is listed and protected by law by the Norwegian Directorate for Cultural Heritage.
Gamle rådhus (Oslo)
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The Old Town of Oslo (, ) is a neighborhood in the inner city of Oslo, Norway, belonging to the borough of Gamle Oslo and is the oldest urban areas within the current capital. This part of the capital of Norway was simply called Oslo until 1925 while the city as a whole was called "Kristiania". Oslo's old town was established with the urban structure around year 1000 and was the capital of Norway's dominion in 1314. Old Town core area (i.e. the southern and the central part of Old Town) has several ruins of stone and brick lying above ground, and large amounts of protected culture underground. The core area also has a listed 1700s buildings. Towards Ekeberg slope and further up are some 17th and 18th-century wooden houses that are zoned for conservation under the Planning and Building Act, though there exist in the Old Town many four-storey brick houses, built at the end of the 1800s, and some heritage railway buildings from different eras.
Old Town, Oslo
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King Frederik VI of Denmark later acquired the estate and subsequently gifted the property to the University of Christiania in 1812. In 1814, work began on the University Botanical Garden. The University of Oslo's oldest building, Tøyen Manor ("Tøyen hovedgaard"), is located in the garden. . Today the historic Tøyen Manor houses temporary exhibitions and a café for staff and visitors.
University Botanical Garden (Oslo)
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The oldest building on the lot is a house built in 1867 for Colonel F.P.L. Næser by architect Wilhelm von Hanno. From 1926, the house was the residence of German minister Edmund Rohmberg, and later by Curt Bräuer. The building closest to Drammensveien, was built by the Germans in 1926, and drawn by Oscar Hoff. After the conclusion of World War II, the building was seized by the Norwegian government and made available for the Soviet Union.
Embassy of Russia in Oslo
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The church has seating for just 200 people. It is one of the oldest churches in Oslo that is still in use. The main building is from 1796. The Stone Building is from 1737. In 1880, seating was added and changes were made to the altar and pulpit. From 1934 to 1939, extensive restoration reestablished the look of 1796. The pulpit from 1880 hangs above the altar but is not in use.
Gamlebyen Church
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Oslo Kunstforening is located at "Rådhusgata 19". The gallery, situated in one of the oldest houses in the Kvadraturen area, is the oldest art gallery in Norway. During the year, many varied shows are organized within the fields of drawing, painting, photography, lithography, textile, collage and sculpture. There is usually a new exhibition every month. The gallery features temporary exhibitions of Contemporary Art.
Oslo Kunstforening
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The Old Bishop's Palace in Oslo ("Oslo Bispeborg") was the residence of the Roman Catholic bishops of Oslo. The estate is located in what is now called Gamlebyen (old town) in Oslo, Norway. Various remnants of the medieval bishop's original palace are still visible.
The construction was begun around 1210 by the then bishop, Nikolas Arnesson, continuing through to the early 14th century. The palace built in stone replaced a previous bishop's residence built in wood, established in the 12th century. The main buildings were surrounded by tall walls, and from a tower, a wooden bridge connected the palace to the neighboring Hallvards Cathedral. The palace was built like a fortified castle. 
Together with the cathedral, the palace was not only a religious centre in Middle Age Oslo, it was also of significant political importance. The first agreement of union between Norway and Sweden was signed in the bishop's palace just after the death of Håkon V of Norway, in 1319.
Old Bishop's Palace in Oslo
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He is most associated with his work on Tostrup Yard ("Tostrupgården"), a business premises on Karl Johans Gate in Oslo. The structure was designed by architects Christian Fürst, Torolf Prytz, and Waldemar Hansteen and built between 1896-1898. The five story building was one of the oldest in Norway with load-bearing structures in steel. It was also among the first to have an elevator and use electric lighting.
Waldemar Hansteen
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The Broadcasting House (in Norwegian, "Kringkastingshuset"), also known as the Radio House ("Radiohuset") or the White House ("Det hvite hus"), is the oldest building of the NRK headquarters at Marienlyst, Oslo. The other main building is known as the Television House.
Broadcasting House (Oslo)