giants' grave of s'ena e thomes built during the bronze age

sardegna tomba dei giganti giant tomb necropolis sardinia neolithic nuraghe dorgali calagonone history archaeology archeology cemetery prehistoric rock tombstone europa nature old sky building historical landmark outdoor stone archeological site arzachena bronze age coddu vecchiu costa smeralda emerald cost funerary gallura giants grave italiano prisgiona megalith architecture civilization nuragic complex nuragico sardinian