Fascinated by the tiny early Christian beehive hermitages, intricate, drystone mortarless constructions, in which their hermits lived year round, and which were provided as accommodation for travellers.. So claustrophobic and dark for us, but probably welcoming with a fire inside, and snow outside.
Also, saw some inpregnable ancient stone forts, with claustrophobic tiny rooms, but certainly enemy-proof, also a dry stone, mortarless construction.The Irish were sure shorter than us in the prehistoric times.