The Gleann Mòr structures are unique in the United Kingdom

The prehistoric structures of Gleann Mòr are unique buildings in the United Kingdom and in Europe whose initial use remains completely unknown. Located on the island of Hirta in the Saint-Kilda archipelago, these twenty ruins consist of a main courtyard and smaller cells. The archaeologist Fleming suggested that they could be Pictish constructions erected between the 5th century and the 9th century.