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Photo: Paasikivi, CC BY-SA 4.0 via Wikimedia Commons
Ferris wheel.
SkyWheel Helsinki is a 40-meter 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.
© OpenStreetMap contributors
Open-air swimming pool.
Uspenskin katedraali
A classical and prominent onion-domed Russian church, the largest Orthodox church in Western Europe, Uspenski Cathedral serves Finland's small Orthodox minority. The name comes from the Russian uspenie, from the Dormition (death) of the Virgin Mary. The five domes are topped with 22-carat gold, and some of the icons within are held to be miraculous.
A Catholic cultural center. Dominicans from France founded the Studium in 1949, and the Dominican Order is still responsible for the center's operations. Studium has a library of more than 40,000 books, whose collections focus on Catholic theology.
The museum covers a whole series of old buildings around Helsinki, but the centrepiece is the (short) street of Sofiankatu itself, carefully restored as a replica of the 1930s.
A museum about money and banking, as the name reveals.
Tuomiokirkko
The unofficial symbol of the city, this striking white cathedral dominates the central Senate Square. Based on designs by Carl Ludvig Engel and completed in 1852, the cathedral has been refurbished, and the 12 Apostles are on the roof looking down at the world below. While entry is no longer free, one might argue that the building is more impressive from the outside anyway.