Very nice and quiet place
One of the first things you'll see after disembarking the Suomenlinna ferry is the church Church. The Suomenlinna Church was originally built as an Eastern Orthodox church for Russian troops stationed at Suomenlinna navel fortress in 1854 and had five onion domes. In the 1920s it was converted into an Evangelical Lutheran church and lost its onion domes.
This is the church that serves the beautiful fortress on a cluster of islands in the harbour near Helsinki. Great, scenic walks with lots of interesting museums and cafes and restaurants. Pretty much a small town unto itself, as you see from the primary school and children's library.
Located on Suomenlinna Island you will need to get a ferry to see this place but if you are going to see the fortress it makes sense to come here too. A quaint church in a village style it is not architecturally impressive but it is very photogenic.
You can go to Finnish Fort by boat with a daily ticket, the sun is shining ☀️☀️☀️