Färentuna Church was built around the year 1175. The nave was enlarged in the 15th century when the church was under the protection of Karl Knutsson Bonde. The enlargement was made for his daughter’s weddings because the church was too small for all people. The latest notable reconstruction was made in 1732, when the medieval tower was replaced by the present wooden cap.
The pulpit of Färentuna church was made in 1701 as the monument of Carl XII’s victory in Narva battle. The oldest sculpture is a wooden Madonna carved in the 13th century. The runestone fragments U 20 and U 21, made in the 11th century, can be seen in the church wall to the left of the front gate. Together with the Hillersjö stone and the Snottsta and Vreta stones Färentuna runestones tells the story of the family of Gerlög and Inga. All of the Färentuna runestones are inscribed in the younger futhark.References:
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.