The Church of St. Michael in Synkavichy is a Gothic church was built in 16th century. It is one of the first fortified churches in Grand Duchy of Lithuania. In 1880-1881, the temple was significantly reconstructed. In 1926, it was rebuilt as a Catholic church. In 1988-1990, it become Orthodox. This site was added to the UNESCO World Heritage Tentative List in 2004.
The defensive system of the church consists of four towers and loopholes placed under the vaults. The interior of the church looks like a hall, its cross-shaped vaults with nervuses rest on six pillars. With the purpose to improve the defence capacity the windows are raised high above the ground.
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.