National Internment Camp for Women in Hovedøya

Hovedøya Abbey (Hovedøya kloster) was a medieval era Cistercian monastery on the island of Hovedøya in Oslofjord outside of Oslo, Norway.

Hovedøya is one of several small islands off the coast of Oslo, Norway in the Oslofjord. The island is quite small, no more than 800 metres across in any direction, the total area is 0,4 square kilometre. It is well known for its lush and green nature, with a wide variety of trees, bushes and flowers. For many, many years there was a military base on the island.

Bleikøya is an island in the inner part of Oslofjord, in the municipitality of Oslo. It is located between Hovedøya and Sjursøya. From the late 19th century, a sanatorium for children suffering from scrofula was located on the island.In 2008 the Bleikøya Nature Reserve was established on the northeastern part of Bleikøya, including the islet Bleikøykalven.

The Oslo Tunnel (Norwegian: Oslotunnelen) is a 3,632-metre (2.257 mi), double-track, railway tunnel which runs between Olav Kyrres plass and Oslo Central Station (Oslo S) in Oslo, Norway. The tunnel constitutes the easternmost section of the Drammen Line and runs below the central business district of Oslo. It features the four-track Nationaltheatret Station, Norway's second-busiest railway station, where the Oslo Tunnels lies directly beneath the Common Tunnel of the Oslo Metro. At Frogner, the Elisenberg Station was built, but has never been used. The tunnel is the busiest section of railway line in Norway and serves all west-bound trains from Oslo, including many services of the Oslo Commuter Rail and the Airport Express Train. Traditionally, Oslo had two stations, the larger Oslo East Station (or Oslo Ø, located at the spot of the current Oslo S) and Oslo West Station (Oslo V), which served the Drammen Line. This caused a physical barrier between the two parts of the railway network, only connected by the Oslo Port Line which ran partly in city streets. Formal planning of a central station and a tunnel connecting the Drammen Line to Oslo Ø started in 1938, and the final plans were approved in 1968. The Oslo Tunnel opened on 1 June 1980, and made it possible to close Oslo V in 1989. Nationaltheatret saw a major upgrade in 1999, when it was expanded to four tracks, and from 2008 to 2010, the tunnel saw a major technical upgrade. There are plans to build a second tunnel to increase train capacity west of Oslo.

Gressholmen is an islet located in the Oslofjord, just south of central Oslo. Administratively it belongs to the borough of Gamle Oslo. Gressholmen airport was for the years 1927 through 1939 the location of the main airport for Oslo, until the construction of Fornebu airport. The airport was only for seaplanes. The ramp with rail tracks and the hangar are reused for boat storage and maintenance. There is railway point with the big track gauge. The island is easily accessible from Oslo with the local ferries. The access point is on the North side. A big part of the island is a nature reserve.

Tjuvholmen skulpturpark is a sculpture park in the Tjuvholmen neighborhood of Frogner borough in Oslo, Norway. It is close to Aker Brygge.

Akershus Fortress (Norwegian: Akershus Festning, pronounced [ɑkəʂˈhʉːs ˈfɛ̂sːtnɪŋ]) or Akershus Castle (Norwegian: Akershus slott [ɑkəʂˈhʉːs ˈslɔtː]) is a medieval castle in the Norwegian capital Oslo that was built to protect and provide a royal residence for the city. Since the Middle Ages the fortress has been the namesake and centre of the main fief and later main county of Akershus, which was originally one of Norway's four main regions and which included most of Eastern Norway. The fortress itself was located within the Akershus main county until 1919, and also within the smaller Akershus sub county until 1842. The castle has also been used as a military base, a prison and is currently the temporary office of the Prime minister of Norway.

Anatomigården is a historic house located on the north side of Christiania Torv in Oslo, Norway.

Tjuvholmen is a neighborhood in the borough Majorstuen in Oslo, Norway. It is located on a peninsula sticking out from Aker Brygge into the Oslofjord. It is located east of Filipstad and south of Vika. At the tip of the peninsula, next to the sculpture park, is an outdoor bathing area. The water leads out to the Inner Oslofjord. The area was bought by the shipyard Akers Mekaniske Verksted in the mid 19th century, who planned to build a drydock there. Instead, it was bought by the municipality in 1914, and transferred to the port authority in 1919. They built docks and artificial land, increasing the area from 5 to 33 hectares (12 to 82 acres). From the 1960s, Fred. Olsen & Co. rented the docks, and from 1971 Nylands Mekaniske Verkstad had a shipyard on the spot. Since 1982, the area has been used for office space, terminals, and warehouses. The Norwegian National Academy of Ballet was located there. Since 2005, the area has been sold to private developers, who are conducting an urban renewal with housing. The area has about 1,200 apartments since 2012. It is part of the Fjord City urban renewal program. This program has seen the opening of several art galleries, amongst them the Astrup Fearnley Museum of Modern Art and the Gallery Haaken. Tjuvholmen skulpturpark, next to the museum, was created by Renzo Piano.

Norway's Resistance Museum also known as the Norwegian Home Front Museum (Norwegian: Norges Hjemmefrontmuseum) is a museum located at the Akershus Fortress in Oslo. The museum collection focuses on Norwegian resistance during the occupation of Norway by Nazi Germany from 1940 to 1945. The museum displays equipment, photos and documents from the war years.The museum was established as a foundation in 1966. The Museum was opened to the public in May 1970 by Crown Prince Harald of Norway in celebration of the 25th anniversary of Norwegian liberation. Architectural planning was entrusted to Norwegian architect Otto Torgersen (1910-2000) who working together with key personnel representing various branches of the underground forces, produced a chronological gallery through the period from the prelude in the 1930s onwards to liberation in 1945. The museum's first manager was Knut Haugland, who managed the museum until 1983. Tore Gjelsvik was chairman of the museum's council from 1964 to 1973. Arnfinn Moland was appointed manager of the museum in 1995.

Aker ASA is a Norwegian industrial investment company with ownership interests concentrated in oil and gas, renewable energy and green technologies, industrial software, seafood and marine biotechnology sectors. The company is listed on Oslo Stock Exchange. Aker's main shareholder is Kjell Inge Røkke, who owns 68.2% per cent of Aker through his company TRG Holding AS. The corporate headquarters are located in Fornebu, Norway. Aker was established in 1841 when Akers Mekaniske Verksted was founded in Oslo.

Fortification Upgrades (1673–1675) was a re-organization of military forces and strengthening of the defenses of Norway. The Norwegian army in this period became much better prepared for conflict with Sweden than in any previous period. It numbered 12,000 men in five regiments of infantry, 6 companies of cavalry, and an artillery division with 76 field pieces. An additional Norwegian regiment was serving in Denmark. Ulrik Frederik Gyldenløve, Count of Laurvig was dispatched to Norway to evaluate the military forces in Norway. Gyldenløve was appointed Governor-general of Norway (Statholder) from January 1664 and commander-in-chief of the Norwegian army two years later. In 1673, Gyldenløve conducted a tour of facilities, after which he recommended upgrades to both the fortresses and the military forces. During the summer of 1675, 1800 men were kept at work on the fortresses at Akershus, Fredrikstad, and Fredriksten.