Tamminiemi villa was one of the official residences of the President of Finland from 1940 until 1981. From that date, until his death, it served as the residence of President Urho Kekkonen. Designed by architects Sigurd Frosterus and Gustaf Strengell, the jugendstil villa was built in 1903 for the Danish-born businessman Jörgen Nissen. The villa was later owned or rented by a number of individuals, before being acquired by the publisher and artistic patron Amos Anderson in 1924. Anderson donated Tamminiemi to the Finnish State in 1940, to serve as a presidential residence.
Although Presidents Ryti and Mannerheim resided at Tamminiemi, the villa is particularly associated with President Kekkonen - due in large part to the fact that it was his home for around thirty years. President Paasikivi preferred to use the Presidential Palace as his official residence during his presidency. Tamminiemi also has a famous sauna which president Kekkonen used to entertain his guests.
Today Tamminiemi is the Urho Kekkonen Museum. It’s closed due to renovation and will open in 2012.
Reference: Wikipedia
Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.