A striking example are the well-known megalithic domed structures in Sardinia called 'Nuraghe' that were built between 1900 and 730 BCE \cite{Depalmas2010}. They are double-layer structures with a rubble in-fill, where the exterior layer has the shape of a truncated cone and the interior layer, made by stacking minimally processed stones in an ashlar pattern, has a beehive shape forming "corbel vault". Constructed by offsetting consecutive courses of stones towards the centre until they meet at the apex of the dome, it is a technique that was also used to construct beehive-shaped "tholos" tombs, for example on the Iberian Peninsula, since pre-historic times (QUOTE) (Fig. \ref{389787}).