One of the most important buildings in history of Christianity discovered off Scottish coast | The Independent (independent.co.uk)
Archaeologists have located one of the most important buildings in the history of Western European Christianity – but it’s not a vast cathedral or an impressive tomb, but merely a humble wattle and daub hut on a remote windswept island. Using radiocarbon dating techniques and other evidence, the  scholars –  from the University of Glasgow – believe they have demonstrated that the tiny five-metre square building was almost certainly the daytime home of early medieval Scotland’s most important saint, St Columba.
http://www.independent.co.uk/News/science/archaeology/christianity-building-hub-scotland-discovery-monastic-university-glasgow-dark-age-bible-a7834366.html