Dunglass Castle, situated in West Dunbartonshire, is a ruinous castle, originally constructed during 1400–1542. A large section of high wall remains, to approximately 7–8 metres high, with a mixture of original and newer construction. A small conical dovecot also exists on the south wall but it is now completely ruined. The castle and courtyard stone was taken in 1735 to use in repair of the quay following an order by the Commissioners of Supply.
Near the west end of the wall, and outside the south wall is a small landing place appearing to have been protected by a hoarding – some corbels for which still remains. At the North-West corner of the enclosure is a dwelling house, partly old, possibly dating back to 1590, but mostly modern – the interior is wholly so. The round tower is probably from the 17th century and appears to have been a pigeon house.
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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.