I visited Volterra in August 2013. It is quintessial Etruscan Tuscany at its best. The view of the town and the valley from the South side is breathtaking. There are several doorways that lead to the heart of Volterra and one not to be missed is the Porta all'Arco. In the city centre, it is worthwhile visiting Palazzo dei Priori, the Cathedral, minor churches and the Pinacoteca & Museo Civico. Another highlight for me was the Roman Theatre which can be seen from above from a panoramic point and then you can hike all the way around the fence. The entrance fee was around 4 euros but you could might as well not pay the entrance fee because it doesn't add much to what you see from outside. An interesting town which happens to be overshadowed by other WHS and landmarks in the region!