Port of Helsinki

South Harbour (Finnish: Eteläsatama, Swedish: Södra hamnen) is a bay and harbour area immediately next to the centre of the city of Helsinki, Finland. 4.7 million passengers in liner traffic and some 37 000 international cruise passengers travel through it every year. In addition to that, also over million tonnes of unitized cargo passes through the South Harbour. The most of the harbour's traffic is to Stockholm, Sweden and Tallinn, Estonia, and cruises. In summertime, there is also much small ship traffic. The bay is bordered by the districts of Katajanokka, Kaartinkaupunki, Ullanlinna and Kaivopuisto. The waterway leading to the South Harbour is 9.6 metres deep. The most critical point on the waterway is the Kustaanmiekka strait, with a width of 80 metres. The waterway has a speed limit of 30 km/h, except for the Katajanokka area, which has a speed limit of 10 km/h.

Allas Sea Pool is a marine spa and lido in Katajanokka, Helsinki, Finland. It was opened on 1 September 2016 on the site of the former Kanavaterminaali building. The spa has three pools built on top of the sea: a children's pool, a warm pool and a seawater pool, as well as a sauna and a café. The main building of Allas Sea Pool was completed in spring 2017. The building has a roof terrace spanning its entire roof. With 1500 places Allas Sea Pool is the largest terrace in Helsinki.The spa is intended to be open all year round.

SkyWheel Helsinki is a 40-meter (131 feet) tall Ferris wheel in central Helsinki, Finland. One of its gondola cabins, the SkySauna, is the world's first sauna on a Ferris wheel. It opened to the public on June 3, 2014. It was originally named the Finnair SkyWheel and its placement on Katajanokka harbor is where the airline Finnair first located its flight operations in the 1920s.

The Norrmén house, also known as the Norrmén castle and palace, was a red brick residential house representing the neo-renaissance architecture, situated for 63 years in Katajanokka, Helsinki, Finland, opposite the Uspenski Cathedral. It was designed by architect Theodor Höijer for the chairman of the Helsinki city council, Alfred Norrmén, who ordered the building plans from Höijer in 1896. The four-floor building was constructed at a fast pace, and the building was already completed in 1897. The top floor of the building contained high-class large apartments, while the much smaller apartments on the bottom floor were mainly reserved for servants. Alfred Norrmén himself lived in the building until his death in 1942. The building also hosted the Eastern Emigrants Club and its restaurant until 1944, when it was discontinued. Later the building hosted the Allied Commission. The Norrmén house was dismantled in 1960. The Enso-Gutzeit (currently Stora Enso) main office, built from white marble and designed by Alvar Aalto, was built in its place. It was completed in 1962. The dismantling of the house has been criticised ever since the year of its dismantling, and many view Aalto's new building in its place as completely unfit for the façade of Katajanokka, and the dismantling of the Norrmén house as one of the greatest wrongdoings in the history of Helsinki. Some have even proposed that Aalto's building should be dismantled and a replica of the Norrmén house should be built in its place. However, the city of Helsinki, along with the National Board of Antiquities is strongly in favour of preserving the main office building. In the 2004 film Pelikaanimies, directed by Liisa Helminen, the Norrmén house has been digitally built back in its place.

The Stora Enso headquarters is an office building located in the Katajanokka neighbourhood of central Helsinki, Finland, completed in 1962. It is notable for having been designed by the Finnish architect Alvar Aalto.

The Olympia Terminal (Finnish: Olympiaterminaali, Swedish: Olympiaterminalen) is a dock in the South Harbour of Helsinki, Finland. It was designed by the Hytönen-Luukkonen architects bureau and opened for the 1952 Summer Olympics. Today, the terminal has a regular connection to Stockholm, acting as Silja Line's Helsinki terminal. Over 1.5 million passengers travel through the Olympia Terminal annually. A currency exchange point, an ATM and a café are present in the building. Silja Line’s MS Silja Serenade and MS Silja Symphony operate daily to Stockholm’s Värtahamnen, departing at 17:00.

Uspenski Cathedral (Finnish: Uspenskin katedraali, Swedish: Uspenskijkatedralen, Russian: Успенский собор, Uspenskij sobor) is an Eastern Orthodox cathedral in Helsinki, Finland, and main cathedral of the Orthodox Church of Finland, dedicated to the Dormition of the Theotokos (the Virgin Mary). Its name comes from the Old Church Slavonic word uspenie, which denotes the Dormition.

The Market Square (Finnish: Kauppatori, Swedish: Salutorget) is a central square in Helsinki, Finland. It is located in central Helsinki, at the eastern end of Esplanadi and bordering the Baltic Sea to the south and Katajanokka to the east. HSL maintains a year-round ferry link from Market Square to Suomenlinna, and in the summer there are also private companies providing ferry cruises, both to Suomenlinna and to other nearby islands. The Presidential Palace, Helsinki City Hall, Swedish Embassy and the Stora Enso Headquarters building (designed by Alvar Aalto) are all located adjacent to Market Square. From spring to autumn, the Market Square is active with vendors selling fresh Finnish food and souvenirs. There are also many outdoor cafés at the square. Some cafés also provide meat pastries (Finnish: lihapiirakka). The height of the square's popularity is in early October, when the annual Helsinki herring market (silakkamarkkinat) begins. A long tradition at the Market Square is a display of old American cars on the first Friday of every month. Any motorist with an interest in old American cars may participate in the display. Seagulls have become an increasing menace in the Market Square, swooping down to snatch snacks and ice cream from the hands of unsuspecting tourists.

The Presidential Palace (Finnish: Presidentinlinna, Swedish: Presidentens slott) is one of the three official residences of the President of the Republic of Finland. It is situated in Helsinki, on the north side of Esplanadi, overlooking Market Square.

The Main Guard Post (Finnish: Päävartio) is a guard post building and a city block in the district of Kruununhaka in Helsinki, Finland, in connection with the Presidential Palace at Mariankatu 1. The buildings in the block mostly date from 1843. As well as the guard post building, the block includes the financial building of the Presidential building, containing offices, maintenance spaces, garages and apartments. The building is most often cited as designed by Carl Ludvig Engel, but sometimes by Eduard von Anert.From 1820 to 1840 the Main Guard Post was located at the base of the Helsinki Cathedral. This former Main Guard Post building was dismantled in 1836 as it was seen that detaining prisoners, the main purpose of the Main Guard Post, was not something fit near a church.When the Heidenstrauch house was renovated into the Imperial Palace (and later into the Presidential Palace) in 1843, the Main Guard Post was also moved in connection with it. Historically, the Main Guard Post has been the central guard post of the Helsinki garrison, acting as a post to guard the most important military targets, military behaviour and the overall situation of military targets. It has also been used to detain soldiers detained because of, for example, absence without leave or consumption of alcohol.Both the main guard post and the financial building remain in almost their original use to this day. The main guard post hosts offices for the Helsinki garrison. The disused prison cells now serve as break rooms for the guards.The most visible part of the Main Guard Post is the guard in front of its main entrance. Enlisted men serving as guards are selected from the military police serving in the Guard Jaeger Regiment. The guard is present at the entrance from 07:45 in the morning to 22:00 in the evening and one guard shift lasts an hour at the most, only 20 minutes in cold winter weather. During their shift, guards must stand absolutely still. Some guards have felt dizzy or even fainted during their shift. The guards carry assault rifles on their backs but these have been disabled so that they can not be actually fired. This is because of safety reasons: if someone were to steal a guard's rifle, they could not use it to fire.During the Finnish Civil War, the Main Guard Post was one of the last bastions of the Reds in Helsinki. In 1918 the building was also used to retain political prisoners. A metal disc attached to the door of a prison cell signified the background of the prisoner: a red disc meant a political prisoner, a blue disc meant a criminal.The building is listed on the Finnish Building Heritage Register.

Helsinki University Observatory housed the Department of Astronomy at the University of Helsinki, south Finland until end of 2009. It is now an astronomy-themed visitor centre and museum.

Tähtitorninvuori or Tähtitorninmäki (Swedish:Observatorieberget/Observatoriebacken) is a rocky hill about 30 meters high in Ullanlinna, Helsinki, next to the South Harbor. The hill is mostly a park, but there are also a few public buildings.At the top of the hill, at the southern end of Unioninkatu, is the Helsinki University Observatory, which was completed in 1834 and is named after the observatory towers. Today, the Observatory serves as a public center for astronomy and is not used for research purposes. Astronomical observations there can no longer be made because the city lights completely obscure the dim objects in the starry sky. Researchers can make observations e.g. In Metsähovi in Kirkkonummi or abroad.In the past, the observatory was clearly visible as the end point of the long and straight Unioninkatu, up to Kallio Church, but today the trees growing on both sides of Copernicus Road almost obscure it from view.