Suomenlinna open prison is located in Helsinki, the capital of Finland. The facility is located on one of the islands that make up the Suomenlinna district, a district of Helsinki. Suomenlinna open prison was founded in 1971 as a subordinate to Helsinki Provincial Prison. It was established so the people in detention could help with renovating and maintaining the Suomenlinna fortress which is UNESCO world heritage. Renovating and maintaining the fortress is still one of the possible activities for the residents but the possibilities have broadened since then. Suomenlinna open prison has developed into an independent facility and was transformed into an open prison in 2006.