Penningby Castle is one of the most well-preserved castles from the early Vasa era. Penningby Manor is first mentioned in the 1330s. To the northeast is an overgrown ruin castle with a moat, which may be the remains of a predecessor to the castle. Its earliest owners included Lord Tord Bonde, burgrave of Raasepori and margrave of Viipuri castles. In late 15th century, a fortress was built by its owners, initiated by Lady Birgitta Tordsdotter Bonde, daughter of Tord Karlsson (Bonde), Lord High Constable of Sweden. The medieval castle was a so-called twin house unusual in its placement near the sea coast.
The immense tower was erected just before 1550s under Lord Lars Turesson, Tre Rosor. In his time, the eastern façade got a new entrance. Later, the sea tower got its round salon, arguably the most beautiful room in the castle.
In 1805 countess Maria Juliana von Rosen had the castle garden recreated in a so-called English style. In 1831, a fire destroyed the interiors of the castle, but parts of it, for example the ceiling, were restored, and the tower was modified. A section of the medieval walls are yet left. A restoration was carried out from 1951 to 1953. Penningby castle was declared a national cultural heritage (byggnadsminne) in 1980. Today the castle is not inhabited, but visitors may have access to it in summer season.
Olof Persson Stille, one of the early settlers in New Sweden, was employed on the Penningby Manor. In 1641 Olof Stillé, a millwright by trade, was the original owner of the area which is today Eddystone, Pennsylvania. Stillé was one of the four commissaries or magistrates appointed to administer justice among local inhabitants, and thus became a judge of the first court on the banks of the Delaware River.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.