Tõstamaa Manor was first mentioned in 1553 as Testama, when it belonged to the Bishop of Ösel–Wiek. Lated the owners have been the Kursells, Helmersens and Staël von Holsteins. The Early-Classical two-storey main building was built in 1804. During a renovation in 1997, several original painted ceilings were uncovered. The manor was dispossessed in 1919 and since 1921 a local school (Tõstamaa Keskkool) is operating in the main building. The most famous inhabitant of the manor is probably Alexander von Staël-Holstein, who grew up and spent his childhood at the manor.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.