Ruins of a medieval fortification.
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Mustavuoren lehto ja Östersundomin lintuvedet
The area is protected under the European Union's Natura 2000 ecological network program. There are many different forest types and bird species here.
At 86 m, Cirrus was the tallest building in Finland when opened; with Majakka finished, it's not even the tallest in Helsinki, but still a notable landmark in Vuosaari. There were plans to make the an observation platform of the highest floor, which weren't realized.
A little known fact is that Helsinki Metro is the world's northernmost metro system. Why not ride all the way to Mellunmäki, which is the world's northernmost metro station?
Yearly music festival in Kontula with performances by Finnish 1980s rock artists and hip hop crews from Eastern Helsinki among others.
One of Helsinki's modern cultural centers hosting various galleries.
Vuosaarenhuippu
Plenty of routes for hikers of all levels, from easy-to-walk service roads to rocky little paths.