Volterra's Etruscan walls date from the 5th - 3rd century BCE. With a total length of 7.3 km
and an enclosed area of 116 hectares, they protected vital fields, temples and housing for about 25 000 people.
The Porta all'Arco, the Porta di Diana and impressive remains of the walls survive to this day.
|(Left) The Porto all'Arco, repaired 2nd century BCE.|
Note the three badly eroded stone heads. Theories on their meaning abound. They may represent the decapitated heads of former adversaries, portraits of former prominent citizens, or most likely, the Etruscan "trinity" of Tinia, Uni and Menrva,