The external arches (intentionally irregular) represent the access doors from the sea towards the land and are reminiscent of the Giants' Tombs, structures present throughout the countryside and dating back thousands of years ago.... In fact, when the rest of Europe was still living on the trees, the Nuragics knew the places of energy and used them to heal. Not only that, the Giants' Tombs represented the union of the society settled in that territory in the form of a scattered settlement that was concentrated in the points where control, defence, pursuit of economic survival were possible.