The Kuopio Museum was established in 1907 and it is the third oldest museum in Finland. The Jugend-style building, designed by J. V. Strömberg has been influenced by Finnish castles, such as Olavinlinna and the castle of Vyborg.
There are two museums located in the building: The Kuopio Cultural History Museum and the Natural History Museum. The permanent exhibitions of the Cultural History Museum provide information on the prehistory, settlement, local livelihoods, industry and the ways of life in Northern Savo. The smoke cottage, old-style coffee shop and Savo-style rowing boat tells a story of the area's history and traditions.
The Natural History Museum displays the ecological systems of the nature in Eastern Finland. The main themes are winter and summer. The most popular showroom is the mammoth interior, which shows the nature as it was 22 000 years ago. The botanical and zoological collections belong to the the most important collections in Finland.
Ängsö Castle was first named as "Engsev" in a royal charter by king Canute I of Sweden (r. 1167-1196), in which he stated that he had inherited the property after his father Eric IX of Sweden. Until 1272, it was owned by the Riseberga Abbey, and then taken over by Gregers Birgersson.
From 1475 until 1710, it was owned by the Sparre family. The current castle was built as a fortress by riksråd Bengt Fadersson Sparre in the 1480s. In 1522, Ängsö Castle was taken after a siege by king Gustav Vasa, since its owner, Fadersson's son Knut Bengtsson, sided with Christian II of Denmark. However, in 1538 it was given by the king to Bengtsson's daughter Hillevi Knutsdotter, who was married to Arvid Trolle.
In 1710, the castle was taken over by Carl Piper and Christina Piper. Ängsö Castle was owned by the Piper family from 1710 until 1971, and is now owned by the Westmanna foundation. The castle building itself was made into a museum in 1959 and was made a listed building in 1965. It is currently opened to visitors during the summers.
The castle is a cubical building in four stores made by stone and bricks. The lower parts is preserved from the middle ages. It was redecorated and expanded in the 1630s. The 4th storey as well as the roof is from the expansion of Carl Hårleman from 1740-41. It gained its current appearance in the 1740s.