The Church of St St Michael and All Angels, is the former parish church of Gwernesney. The church is thirteenth century in origin but with much fifteenth century work. The double bell gable, and more, was restored in 1853–4 by John Pollard Seddon. It is built of Old Red Sandstone.
The interior contains a late medieval screen. The church register of baptisms and burials dates from the year 1758 and that of marriages from 1757.
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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.