According the legend the church of St. Olav in Vormsi was originally built in 1219 in the guidance of Valdemar II, the King of Denmark. Although, the oldest parts of the church has been dated to the year 1400 (approximately). It has been renovated and reconstructed several times, at least in 1632, 1772 and 1929. The St. Olav’s church is unique for the fact that it has no belfry; the bell hangs above the door under the high ridge.
In the churchyard you can see several old tombs of the Swedish inhabitants, who lived in the Vormsi island until World War II. A bit furthrer is an old graveyard with the largest collection of wheel crosses in Estonia. The oldest cross dates back to 1743, the freshest one to 1923. All crosses are handmade by the peasants. Many of the wheel crosses bear clear writings but many of the crosses are of primitive treatment and have many grammatical errors. The crosses often bear the village names, sometimes also farm names, but almost always family marks. The wheel crosses often bear several dates which all show dates of death. Death dates were probably marked on an old family cross when the wooden cross on the grave decomposed. In 1977, Ministry of Arts started the inventory of wheel crosses.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.