Pitsligo Castle originated as a 15th-century keep. There is an arched gateway in the west wall of the outer court, with the date 1656 and the arms of the Forbes and Erskines. In the inner court the date is shown as 1663. At the north-east angle of the courtyard there is a tall flanking drum-tower. The main tower had three vaulted stories, but almost all above the lowest has disappeared. There is a stair tower at the north-east corner which is better preserved. There are panels dated 1577 over the courtyard doorway.
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.