The mansion it not as old as you might think, but during its relative short life it has been through a lot of interesting phases. It was built as a magnificent private home for the Tamm family in 1921, they were never really comfortable living there though. They had been warned against building on the property of the Black Knight and some say it is his ghost that drove them out of the mansion. The family left after only a few years.
When the Tamms moved out, the mansion was turned into an inn. In the brochure from 1935, they promise that "novelties such as hot and cold water in every guest room do not compromise the genuine mansion atmosphere".
During World War II, the mansion was turned into a sanatorium for Finnish soldiers with tuberculosis. They did not mind the Black Knight, on the contrary, they called it Paradise Inn. It was a great place for healing and continued to be a sanatorium and later a hospice for “unstable women” until 1976 when Nick Arskin bought Tammsvik and turned it into a conference facility.