Patarei prison in Tallinn Estonia
In 1828 Nicholas I of Russia mandated the building of the sea fortress of Patarei. Completed in 1840, it is located on area of 4 hectares (10 acres). Over the years it has had different functions, in 1867 functioning as barracks, in 1920 as a prison until 2004 when the last prisoner were relocated to another newer prison. Last person executed in Patarei was in 1991, the killing room was painted red/brown so blood splashes would not be visible.