Photo: Pertsaboy, CC BY-SA 3.0 via Wikimedia Commons
The largest church in Helsinki and a fine example of Gothic Revival architecture.
St. John's Church in Helsinki, Finland, is a Lutheran church designed by the Swedish architect Adolf Melander in the Gothic Revival style. It is the largest stone church in Finland by seating capacity.
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Exhibitions of modern commercial and industrial design and modern art. The permanent exhibit in the basement showcases the history of consumer-goods design over the course of the 20th century, with a particular focus on the contributions of Finnish designers. If you're a fan of Finnish design products like Marimekko fabrics, Arabia porcelain and Iittala vases and their prototypes this is definitely not a place to miss.
Diananpuisto
Also known as Kolmikulma (the triangle), this pocket sized park is a nice place to take break from your sightseeing in the summer and just sit down on a park bench and have an ice-cream.
Tähtitorninvuori
As the name reveals, this hill rising above the Olympia and Makasiini terminals of South Harbor hosts an observatory, and from the hill you have a nice albeit partial view over the city centre (part of the view is obstructed by trees). It is also the place for people to picnic on the may day festival Vappu and on the morning of the Finnish Independence Day the hill hosts a televised flag rising ceremony.
Saksalainen kirkko
The Lutheran Church of the German community is situated at the foot of the Observatory Hill and is a visible landmark if you are walking from the Silja Line ferry towards downtown. The Neo-Gothic church was built in 1864 and is also a venue for liturgical and classical concerts.
Merkki
In the newspaper museum you can learn more about the history of newspapers - journalism and printing.
A prime example of 1930s functionalism at the border of districts of Eira and Punavuori. Slightly unusually for this architectural style it's constructed in red bricks. The spire of the church can be lowered into the church tower, a feature that was used during WWII to make it less visible for Soviet bombers.