Isosaari

Kuivasaari (Torra Mjölö in Swedish) is a Finnish island in the Gulf of Finland, near Helsinki. Kuivasaari is located some 5 kilometres (3 miles) out into the Gulf of Finland, due south of Helsinki city centre, and was for many years the outermost inhabited island in the Helsinki archipelago (now there is no permanent settlement based on the island). It lies parallel to the Harmaja lighthouse, and the main shipping route into and out of Helsinki passes between the two. In fair weather the city of Tallinn, Estonia on the southern shore of the Gulf of Finland is visible from the observation tower. The whole island is a military installation of the Finnish Defence Forces, and access for civilians is heavily restricted. A number of coastal artillery guns are installed there, including some exceptionally heavy 12-inch (305 mm) pieces. The island served as an important coastal artillery fort protecting the entrance to Helsinki harbour during the World Wars. The island gets its name, meaning 'dry island', from the fact that there is no fresh water on the island, and water is instead pumped from the nearby Isosaari island.

Santahamina (Swedish: Sandhamn) is an island and neighbourhood of Eastern Helsinki, Finland. At present it is a military base housing the Guard Jaeger Regiment, making access restricted. The Finnish National Defence University (NDU) is also located on the island. Santahamina housed before 2007 a mediumwave broadcasting station used by Yle for broadcasting on 558 kHz with 100 kW.

The Finnish National Defence University (Finnish: Maanpuolustuskorkeakoulu, MPKK, Swedish: Försvarshögskolan) is the Finnish Defence Forces' university located in Helsinki. The university trains officers for the Defence Forces and the Finnish Border Guard. The main campus is located in Santahamina, Helsinki. Prior to 2007, the school referred to itself, in English, as the National Defence College.

Vallisaari (Swedish: Skanslandet) is an island in Helsinki, Finland. It is located between Suomenlinna and Santahamina. The island has some ponds, and it was first known for hundreds of years as a place where sailors could take fresh water. Some fortifications were built on the island, but while neighbouring Suomenlinna became the main sea fort for Helsinki, Vallisaari was a supply point where cattle was grazing and firewood was collected.Sweden and Russia were at war in 1808 and the Russians besieged Suomenlinna, they used Vallisaari as their base. When ruling the Grand Duchy of Finland Russians began developing fortifications in Vallisaari. It was part of Krepost Sveaborg. After Finland gained its independence in 1917, weaponry of the Defence Forces was stored in Vallisaari until the 21st century. Ordnance, torpedoes, and mines were loaded and maintained; weather observations were made; and gas masks were repaired. There was some civilian population, too, which lead quite rural life farming on the island The civilian population was largest in the 1950s, when the island had even its own primary school.The Finnish Defence Forces gave up the islands in 2008 and Vallisaari was opened as tourism destination in 2016. Before the island was opened, vegetation has been cleared, stairs and railings build and info signs and dry toilets added. The plumbing is not in such a shape that it could be used any more.Now Vallisaari is the most diverse nature destination in the metropolitan area. The Russian history of the island is reflected in the plants, some of which were brought to the island with animal fodder. Military activities have kept the embankments and the meadows between fortifications open, thereby enriching the diversity of nature. Several rare insects and bats fly on the island.

Hevossalmi (Finnish), Hästnässund (Swedish) is a southeastern neighborhood of Helsinki, Finland.

Kuninkaanportti or Kungsporten (Finnish and Swedish respectively for "the king's gate") is the principal entrance to the fortress Suomenlinna (Swedish: Sveaborg) outside Helsinki. It is on the southernmost island of Suomenlinna, in front of the Kustaanmiekka strait, and is considered the main symbol of Suomenlinna. The gate was constructed from 1753 to 1754 at the place where King Adolf Frederick of Sweden anchored his ship when he was coming to inspect the construction of the fortress. The name "the king's gate" comes from this. The gate is a typical fortress gate with cannon openings. There are wide stairs leading to the gate, but in front of the gate is a drawbridge and a wide pit at both sides, to hinder climbing into the fortress. The gate was featured in the 1000 Finnish mark note in the last series, from 1986 to 2001. As a decoration, the sides of the gate feature four stone tablets which were written by the designer of the fortress, Augustin Ehrensvärd, in Swedish: Här har konung Fredrik låtit läggs den första sten år 1748 ("Here laid King Frederick the first stone in the year 1748") Och konung Gustaf har lagt den sista sten år .. ("And here laid King Gustav the last stone in the year", the year is left unwritten, because Gustav III never arrived to lay the last stone) Sveaborg som rörer hafvet på den ena sidan och stranden på den andra, giver den kloke herravälde på både haf och land ("Sveaborg (Suomenlinna), which touches the sea on one side and the shore on the other, gives the wise control both on sea and on land.") Ifrån ödemarker äro desse Vargskiärsholmar ombytte till ett Sveaborg. Eftervard, stå här på egen botn, och lita icke på främmande hielp. ("From desolate lands, these Wolf Islands have been transformed into a Sveaborg (Suomenlinna). Progeny, stand here on your own foundation, and do not rely on foreign help.")

Walhalla is a restaurant located at the fortification walls on the island of Kustaanmiekka, the southernmost island of the Suomenlinna islands in Helsinki, Finland, founded in 1952. The restaurant was named after the Valhallaorden society which was active in Viapori in the 1780s. Nowadays Walhalla consists of three restaurants, including the evening restaurant Walhalla Gourmet, the pizzeria Nikolai and Aurinkoterassi & Bar. The courtyard of the restaurant is also used to host large events. Walhalla is open in summer starting from International Workers' Day, but also functions as a catering restaurant all year round.

Tahvonlahti (Finnish), Stansvik (Swedish) is a southeastern neighborhood of Helsinki, Finland.

The Suomenlinna prison is an open prison in Suomenlinna, Helsinki, Finland, founded in 1971. It was previously known as the Suomenlinna penal colony. The prison is located at the southern tip of the island of Iso-Mustasaari. The prison was founded to help in the repair and restoration work of the Suomenlinna fortress; the prison co-operates with the Governing Body of Suomenlinna belonging to the Finnish Ministry of Education. Prisoners in the open prison, nicknamed Konnala (roughly translated as "Crook-land") work on weekdays in various jobs all over the island, under supervision. Most particularly they repair the buildings and stonework in Suomenlinna or maintain the scenery.In 2017 the average number of prisoners was 137. There are places for 100 prisoners. Prisoners at the Suomenlinna prison are usually near the end of serving their sentences. Some of the prisoners are also studying while serving their sentences.The prison employs about 30 people. The manager of the prison is Sinikka Saarela.

Vesikko is a submarine, which was launched on 10 May 1933 at the Crichton-Vulcan dock in Turku. Until 1936 it was named by its manufacturing codename CV 707. Vesikko was ordered by a Dutch engineering company Ingenieurskantoor voor Scheepsbouw (a German front company) in 1930 as a commercial submarine prototype, being the prototype for the German Type II submarines. Purchased by the Finnish before World War II, she saw service in the Winter War and Continuation War, sinking the Soviet merchant ship Vyborg as her only victory. After the cease-fire with the Allies in 1944, Vesikko was retired. Finland was banned from operating submarines after the war and she was kept in storage until she was turned into a museum ship. Vesikko was one of five submarines to serve in the Finnish Navy. The other four were the three larger Vetehinen-class boats Vetehinen, Vesihiisi, Iku-Turso and the small Saukko. The word "vesikko" is the Finnish name for the European mink.

Jollas is a southeastern neighborhood of Helsinki, Finland located in the eastern part of the Laajasalo island.

Villa Salmela, also known as the Summer home of Karelians, is a villa in the Jollas area of Laajasalo in Helsinki, Finland. It is located in the Villinki Strait opposite the island of Villinki. A summer café is operated in the villa. The villa also has a sauna, which can be used by the public at certain times. The villa is administered by the association Pääsky, which is formed by all the Karelian associations of the Greater Helsinki area.The villa was built in 1886. At the time, it could be reached by a boat three times a week. The original name of the villa was Villa Bergsund, and its first owner was the Actual State Councillor Jaakko Sjölin (1836–1916), who worked as the general director of the Land Survey of Uusimaa. Altogether the villa has had five owners.The city of Helsinki bought the villa, and in 1969 it rented it out to the Karelian associations of the Greater Helsinki. This led to the formation of the association Pääsky, the association of Karelian societies in the Greater Helsinki area. In 2006, the association initiated the renovation and development of the villa. Stairs were built to the villa, and a patio café was built. In 2010, the houses in the area were connected to the water pipe and sewage network of the city, and modern sanitary facilities were built in the villa. The kitchen was renovated, the ovens were rebuilt, and the floors were repaired.