Ronas Hill cairn shows evidence of substantial rebuilding of its upper structure, as evidenced by the lack of lichen on stones above the entry passage and main cyst. The current peak of pink granite stones is clearly visible from the valley below and may have been raised in height to serve as a mede or fishing mark in past centuries. The cairn was certainly altered by soldiers during a military exercise in the 1960s, when a wall was built around its entrance to turn it into a foxhole.