The earliest records of Albu manor date back to 1282, making it the oldest order manor in Järva County and one of the oldest in the whole of Estonia. The renovations carried out between 1995 and 2000 uncovered some beautiful paintings and sections of building from the 14th century.
The current manor was constructed between 1742 and 1748 when Count Gustav Otto Douglas resigned his post as governor of Estonia and retired in Albu. A school has operated out of the manor since 1921. It presently houses Albu Basic School. For the last seven summers the manor has put on exhibitions of a number of different artists. It is open to all visitors in summer from Wednesday-Sunday 12.00 pm-6.00 pm. In the autumn and spring period it is advised to make a booking to visit the manor.
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.