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Photo: MyName (Mahlum), Public domain via Wikimedia Commons
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.
Tähtitorninvuori or Tähtitorninmäki 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.
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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.
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.
Johanneksenkirkko
The largest church in Helsinki and a fine example of Gothic Revival architecture.
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.
Merkki
In the newspaper museum you can learn more about the history of newspapers - journalism and printing.
Finnish Marshall Carl Gustav Emil Mannerheim lived in this villa 1924—51. The museum contains his personal home and a vast array of items he acquired during his life and on his long journeys.