Carn Euny is an archaeological site near Sancreed, on the Penwith peninsula in Cornwall with considerable evidence of both Iron Age and post-Iron Age settlement. Excavations on this site have shown that there was activity at Carn Euny as early as the Neolithic period. There is evidence that shows that the first timber huts there were built about 200 BC, but by the 1st century BC, these had been replaced by stone huts. The remains of these stone huts are still visible today.
Carn Euny is best known for the well-preserved state of the large fogou, an underground passageway, which is more than 20 metres long. This fogou runs just below the surface of the ground and is roofed with massive stone slabs.
The site was abandoned late in the Roman period.
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.