Rauhalinna is Säämingin Leaf-promontory situated wooden villa , which represents rare in Finland villa-style architecture and decorative items. The peace castle was completed in 1900. The ornate villa was designed and built by Major General Nils Henrik Agaton Weckman (1850–1906) of the Russian Imperial Government of Fortress Engineers as a silver wedding anniversary gift for his wife Alma Emilia Sofia Weckman (1855–1921). Design work began in 1895 and construction work began in 1897. Architect Allan Schulman assisted in the design.. Rauhalinna represents an architecturally unique combination of Russian villa architecture, Arabic column motifs and Swiss-style cut and molding decorations in Finland. The original outfit of the villa included a nearly 30-meter-high minaret tower that had to be shortened in the 1920s. 

Rauhalinna was owned by the Weckmann family until 1924, when the Finnish Association of Station Managers bought it. The building came under the Ministry of Defense in 1938, and during World War II it housed a radio listening station under the Headquarters and an air surveillance base. Rauhalinna has been the holiday home of the non-commissioned officers’ association since 1948. In 1954–1965, Sääming’s Tolvaniemi Primary School operated in the building. In the 1970s, the property was transferred from the Department of Defense to the Building Board and leased for tourism use. The peace castle was restored under the supervision of the National Board of Antiquities in 1973 and again in 1987–1988, when the architect was Kirsti Kasnio . Senate Propertiessold Rauhalinna to a private owner in 2001. 

Veikko Heinonen, who has owned Rauhalinna since 2001, died in July 2019. The newspaper in Eastern Savonia was announced for the compulsory auction on 9 October 2019 , together with four forest and water farms. ^{[4] In the} auction, the highest bid of 600,000 euros for Rauhalinna and the surrounding areas of more than 100 hectares was made by Kyösti Kakkonen , who thus became the new owner of Rauhalinna.