Nakholmen

Lindøya is a small island located in the Oslofjord, just south of central Oslo. Administratively it belongs to the borough of Gamle Oslo. In 1920, Lindøya was the Oslo base for the pioneer Norwegian airline, Det Norske Luftfartrederi, and its seaplanes. The operation only lasted until the autumn of 1920. When regular seaplane routes were again established in 1927, the operation was moved to neighboring Gressholmen.

Heggholmen Lighthouse (Norwegian: Heggholmen fyr) is a coastal lighthouse located in the Oslofjord, in the municipality of Oslo, Norway. It was established in 1827, and automated in 1972. The lighthouse was listed as a protected site in 1998.

Dyna Lighthouse (Norwegian: Dyna fyr) is a coastal lighthouse located on a reef south of Bygdøy, in the Oslofjord in the municipality of Oslo, Norway. It was established in 1875, and automated in 1956. In 1992 the lighthouse was renovated as a private banqueting facility, available for parties of 20-40 persons from Easter to Christmas.

Gressholmen Airport (Norwegian: Gressholmen sjøflyhavn) was a water aerodrome situated the island of Gressholmen in Oslo, Norway. It served as the main airport for Oslo from 1927 to 1939, along with Kjeller Airport. The aerodrome consisted of docks, a landing ramp, terminal building and a hangar and used a section of the Oslofjord as its runway. Being located on an island it was necessary to transport passengers by boat to the island. The airport only operated during the summer, typically from May through September. Oslo's first airport was located on the neighboring island of Lindøya, but the authorities preferred Gressholmen as a location. Although plans surfaced in 1919, funding was not ensured until 1926. Norsk Luftruter received a concession to operate the airport, ground handling and the ferry service. Deutsche Luft Hansa commenced the first service on 18 July 1927, flying from Oslo via Gothenburg and Copenhagen to Szczecin. The following year the terminus was moved to Travemünde outside Lübeck. The airport was also used by Halle & Peterson's Norway Post flights during the early 1930s and by Widerøe in 1934. Norwegian Air Lines (DNL) started domestic flights and an international service to Amsterdam in 1935. Deutsche Luft Hansa moved its flights to Kjeller from 1938 and from 1 July the following year all civilian traffic was transferred to Oslo Airport, Fornebu. Gressholmen saw a limited amount of use by the Royal Norwegian Navy Air Service, the Luftwaffe and the Royal Norwegian Air Force until it was closed in 1946. Most of the facilities, including the hangar, remain today and are used for a marina.

The Norwegian Maritime Museum (Norwegian: Norsk Maritimt Museum) is located at Bygdøynesveien on the Bygdøy peninsula, on the western side of Oslo, Norway. The Norwegian Maritime Museum is situated near several other museums, including the Fram Museum; the Kon-Tiki Museum; the Norwegian Museum of Cultural History; and the Viking Ship Museum. The Norwegian Maritime Museum is operated in conjunction with Norwegian Folk Museum.

The Fram Museum (Norwegian: Frammuseet) is a museum telling the story of Norwegian polar exploration. It is located on the peninsula of Bygdøy in Oslo, Norway.Fram Museum is in an area with several other museums including the Kon-Tiki Museum, the Norwegian Museum of Cultural History, the Viking Ship Museum and the Norwegian Maritime Museum. Bygdøy Royal Estate, the official summer residence of the King of Norway, and historic Oscarshall are also located nearby.The Fram Museum was inaugurated on 20 May 1936. It honours Norwegian polar exploration in general and three great Norwegian polar explorers in particular – Fridtjof Nansen, Otto Sverdrup and Roald Amundsen. The museum also exhibits images of the fauna of the polar regions, such as polar bears and penguins.The Fram Museum is centred principally on the original exploration vessel Fram. The original interior of Fram is intact and visitors can go inside the ship to view it. Fram was commissioned, designed, and built by Scots-Norwegian shipbuilder Colin Archer to specifications provided by Norwegian Arctic explorer Fridtjof Nansen, who financed the building of the ship with a combination of grant monies provided by the Norwegian government and private funding in 1891.In May 2009 the Norwegian Maritime Museum and the Fram Museum signed an agreement for the Fram Museum to take over the exhibition of the Gjøa, the first vessel to transit the Northwest Passage. Roald Amundsen and a crew of six accomplished that feat in a three-year journey which was finished in 1906. Gjøa is situated inside her own dedicated building at the museum. In 2017 the ship was made fully accessible to visitors.

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.

The Kon-Tiki Museum (Norwegian: Kon-Tiki Museet) is a museum in the Bygdøy peninsula in Oslo, Norway. It houses vessels and maps from the Kon-Tiki expedition, as well as a library with about 8,000 books. It was opened in a provisional building in 1949. In 1957, the current building—designed by architects F. S. Platou and Otto Torgersen—was opened. In 1978, an extension of the museum designed by Torgersen was opened. The museum was originally built to house the Kon-Tiki, a raft of balsa wood of pre-Columbian model that Norwegian adventurer Thor Heyerdahl used to sail from Peru to Polynesia in 1947. Another boat in the museum is the Ra II, a vessel built of reeds according to Heyerdahl's perception of an ancient Egyptian seagoing boat. Heyerdahl sailed the Ra II from North Africa to the Caribbean after a previous attempt with the reed boat Ra failed.Beneath the raft is a model of the whale shark that the crew encountered on the voyage.The Kon-Tiki Museum is situated near several other museums including the Fram Museum, the Norwegian Museum of Cultural History, the Viking Ship Museum and the Norwegian Maritime Museum.

Gjøa was the first vessel to transit the Northwest Passage. With a crew of six, Roald Amundsen traversed the passage in a three-year journey, finishing in 1906.

Villa Paus (Pausvillaen) is a listed villa in Oslo, Norway. It is located at Christian Benneches vei 6 in Bygdøy.

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.

Langøyene is an island in Bunnefjorden in the inner part of Oslofjord, in the municipitality of Nesodden in Akershus, Norway. It is owned by the municipality of Oslo. Langøyene were originally two islands, Nordre Langøy and Søndre Langøy. The islands were bought by the municipitality of Kristiania in 1902, and the strait between the two islands has been filled with garbage deposits.