Olstrup Church is a Romanesque church built around 1200. In the Middle Ages, the church was originally dedicated to St Lawrence. Built of red brick, the relatively small church first consisted of a Romanesque chancel and nave. It was later extended to the west in the Late Gothic period with a stepped gable. The chancel's cross-vaults and the round chancel arch may date from the church's original construction. The cross-vaults in the nave also seem to be older than the Gothic extension.
In 1936, Egmont Lind discovered frescos in the east vault of the nave which were dated to c. 1575. They present scenes of the Last Judgment. Christ is depicted sitting on a rainbow with his feet on the globe of the Earth, flanked by trumpet-playing angels and the 12 apostles. Some pre-Reformation features such as the lily and sword are included but there are no halos.
The carved pulpit from 1622 has figures of the apostles. The canopy is from c. 1675. On the north wall there is a figure of St Lawrence from c. 1300. There is a decorated font in Gotland limestone.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.