Saint Gertrude's was an Augustine abbey, limited to 12 canons of noble descent. The church was built from the 14th to the 16th century. The tower has an openwork spire, dating from 1453. Inside is an 18th century carillon.
The abbey was closed in 1796 (during French occupation) and the buildings got other uses. In 1919 it became a Benedictine abbey. Reconstructions were carried out after the fire during World War II. The abbey grounds (compound outside the church) at present has mixed uses, and is like a little pleasant park to hang out or have a quiet rest.
During the second world war, the church (as many others in Leuven) was seriously damaged. The artistic choir stalls seemed beyond repair. Fortunately photographs existed. After the war, the stalls were recreated by sculptors, who did an excellent job. The choir with its many wooden sculptures is now one of Leuven's most outstanding works of art. One can distinguish between original parts and later parts by judging the colors of the wood, the older parts being darker.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.