megalithic dolmen of valdecaballeros. archaelogical site landmark. badajoz, extremadura, spain

valdecaballeros archaeological archaelogical architecture construction destinations extremadura prehistoric archaeology megalithic archeology background historical prehistory necropolis neolithic landscape structure landmark monument historic heritage religion outdoors megalith guadiana badajoz ancient history tourism dolmens culture spanish dolmen travel nature burial europe unesco spain stone grave ruins river site tomb rock old sky