by 
Helsinki has many fascinating historical museums. Here are ten popular museums:
1. Helsinki City Museum
Visitors to Helsinki City Museum meet the lighter and darker sides of the city’s history, learn about the roots and cultural background of the people of Helsinki. The main exhibitions are in two places, Aleksanterinkatu 16 and in Hakasalmi Villa. Permanent and temporaty exhibitions.
Address: Main place (Aleksanterinkatu 16), Hakasalmi Villa (Mannerheimintie 13b), Website
2. The National Museum of Finland
National Museum illustrates Finnish history from prehistoric times to the present. The building is designed by architects Eliel Saarinen, Herman Gesellius and Armas Lindgren.
Address: Mannerheimintie 34. Website
3. Seurasaari Open Air Museum
The open-air museum of Seurasaari is located on a beautiful island just a few kilometres from the Helsinki Center. The Museum was founded in 1909. All the different provinces of Finland are represented in 87 well preserved old buildings. The museum is open from may to september.
Address: Seurasaari, Meilahti. Website
4. Suomenlinna Fortress
Suomenlinna was built during the Swedish era as a maritime fortress and a base for the Archipelago Fleet. It located in several islands about two kilometres outside of Helsinki City Center. It is a UNESCO World Heritage Site and one of Finland’s most popular tourist attractions. There is many museums in Suomenlinna (Submarine Vesikko, Toy Museum, Ehrensvärd Museum, Military Museum and Customs Museum). Take a ferry from The Wholesale Market.
Website
5. Natural History Museum
Natural History Museum is top museum for the kids. Experience Finnish nature, history on life, world nature and much more in same building.
Address: Pohjoinen Rautatiekatu 13. Website
6. Designmuseum
Design Museum is an internationally operating museum of design that keeps a national collection in its field. The Museum maintains a 75 000 object design collection. There’s permenent exhibition and temporary exhibitions.
Address: Korkeavuorenkatu 23. Website
7. Museum on Finnish Architecture
The permenent exhibition takes its visitors on a journey into the Finnish architecture of the 20th century. Museum has also temporary exhibitions.
Address: Kasarmikatu 24. Website
8. Finnish Aviation Museum
The Finnish Aviation Museum is a national special aviation museum located close to Helsinki Airport (in Vantaa). The museum collection includes about 80 civil and military aircraft.
Address: Tietotie 3 (Vantaa). Website
9. The Mannerheim museum
Carl Gustaf Mannerheim (1867—1951) was the President and Marshal of Finland. The museum depicting the life and times of Baron Mannerheim. It has been functioning since 1951 in the same villa in the Kaivopuisto district of Helsinki where he lived during the period 1924—51.
Address: Kalliolinnantie 14. Website
10. The Museum of Technology
The Museum of Technology is the only general museum of technology in Finland. The Museum of Technology highlights basic technological phenomena, technical inventions and industrial processes.
Address: Viikintie 1 (Buses 68 and 71 from Railwail Station). Website