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Indoor swimming pool which has also been used for international competitions. Great if you feel like swimming in the winter but don't care for the traditional Finnish "hole in the ice" swimming.
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Paavalinkirkko
A church from the 1930s built of red tiles, one of the first landmarks one will see when driving into Helsinki from Lahti.
Watch some of those tropical animals you wouldn't want to bite or sting you in the indoor terrarium Tropicario.
Only gay sauna in Finland.
Helsingin Messukeskus
For many business travellers the reason to visit Helsinki, but there are also some events around the year that aren't exclusively geared towards professionals like the American car show in April, the book fair in October, ski expo in November and the travel expo in January.
Työväenasuntomuseo
Built for the city's employees and their families in the early 20th century, nowadays the house is a museum where every room is a snapshot of the inhabitants' everyday life during different decades from the 1920s to the 1980s. Visits by guided tours which are free, start about every 15-20 minutes depending on how many visitors have arrived, and are conducted in Finnish, English (whenever foreign travellers show up) and possibly other languages too.