Kuitia is the oldest remaining manor house in Finland. It was built of stone probably in 1480s by noble Joachim Fleming. There has been a manor house in same location from the beginning of the 15th century. Earliest known owner of Kuitia was Maunu Tawast, a bishop of Turku, who donated manor to his brother in 1439.
Because Danish soldiers plundered coastal villages in the 15th century, Kuitia was built also for defensive purposes. Originally the present stone house was part of a foursquare, inner court structure. Current wooden residence was built in 18th and 19th centuries. Kuitia has been privately owned by af Heurlin family about 150 years and is still in living use. Kuitia is open for visitors only with group excursions.
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.