 The oldest structures on St Kilda are the most enigmatic . Large sheepfolds lie inland from the existing village at An Lag Bho 'n Tuath ( English : the hollow in the north ) and contain curious ' boat @-@ shaped ' stone rings , or ' settings ' . Soil samples suggest a date of 1850 BC , but they are unique to St Kilda , and their purpose is unknown . In Gleann Mòr , ( north @-@ west of Village Bay beyond Hirta 's central ridge ) , there are 20 ' horned structures ' , essentially ruined buildings with a main court measuring about 3 by 3 metres ( 10 by 10 ft ) , two or more smaller cells and a forecourt formed by two curved or horn @-@ shaped walls . Again , nothing like them exists anywhere else in Britain or Europe , and their original use is unknown . Also in Gleann Mòr is Taigh na Banaghaisgeich , the ' Amazon 's House ' . As Martin ( 1703 ) reported , many St Kilda tales are told about this female warrior . 
