At Suomenlinna, the Vesikko is the only WWII-era submarine remaining in Finland (the rest were scrapped). It saw action against the Russians during the Finnish Winter War and the Continuation Wars, and was responsible for sinking the Russian merchant ship Vyborg. It’s fascinating to climb inside the cramped space and see how it all worked, accompanied by sound effects, including crew commands, running machinery and a torpedo attack.

Lonely Planet's must-see attractions

Nearby Helsinki attractions

1. Ehrensvärd-Museo

0.19 MILES

Perhaps the most interesting of the museums at Suomenlinna, this was once the home of Augustin Ehrensvärd, who designed the fortress, and later the…

2. Suomenlinna-Museo

0.21 MILES

By the bridge at Suomenlinna that connects Iso Mustasaari and the main island, Susisaari, is Suomenlinna-Museo, a two-level museum covering the history of…

3. Suomnelinna Toy Museum

0.23 MILES

A three-storey wooden cottage houses this delightful private collection of hundreds of dolls and nearly as many teddy bears, dating from the early 19th…

4. Sotamuseo Maneesi

0.24 MILES

On the Suomenlinna island of Iso Mustasaari, Sotamuseo Maneesi has a comprehensive overview of Finnish military hardware, from bronze cannons to WWII…

5. Suomenlinnan Kirkko

0.38 MILES

Built by the Russians in 1854 for their garrison on Suomenlinna, this church originally had five onion domes, and served as an Orthodox place of worship…

6. Suomenlinna

0.48 MILES

Suomenlinna, the ‘fortress of Finland’, straddles a cluster of car-free islands connected by bridges. This Unesco World Heritage site was originally built…

7. Ursa

1.49 MILES

In the Kaivopuisto park, this charming dome-topped observatory was built in 1926. During the darker months, it opens of an evening, while on summer…

8. Kaivopuisto

1.51 MILES

On the waterfront, this sprawling park dating from 1834 is a favourite Helsinki idyll. There are expanses of lawns; numerous sculptures and winding paths;…