Dun Troddan is one of the best preserved brochs in Scotland. It stands on a level rock platform north of the Abhainn a’Ghlaine Bhig, in the lower reaches of Gleann Beag. The neighbouring broch of Dun Telve lies 470 metres to the west, whilst the 'semi-broch' known as Dun Grugaig is around 2 kilometres to the southeast.
Dun Troddan was first sketched in about 1720 when it was still an intact tower. It is thought that it was over 12 metres high in 1720. It was robbed for stone in 1722 during the construction of Bernera Barracks in Glenelg. The broch was visited by Thomas Pennant in 1772, and it was still a substantial structure, although it had lost the upper gallery by this time. The broch consists of a drystone tower which measures around 17.5 metres in diameter, and currently stands to a maximum height of 7 metres. The external walls are 4.5 metres thick at the base.
The entrance is on the southwest side, and is now roofless. On the left side of the entrance passage is a small side-chamber, sometimes called a 'guard cell'. The broch has features now missing from Dun Telve; these include a number of postholes in the floor and a hearth. Built into the hearth is a broken quern-stone. The central court is an almost perfect circle with a diameter of 8.56 metres.
An internal doorway in the remaining high part of the wall provides access to a stairway. From here it is possible to ascend nine stairs to a first floor landing. The landing is 5.7 metres long, at a height of 2.4 metres above the central court. At the end of the landing can be seen the first step which would have led up the next flight of stairs.
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.