Porta Etrusca or Porta dell'Arco in Volterra is an etruscan gate that has been preserved during II World War by the effort of the population that in one night only covered it of stones and prevented German army to bomb it (as a solution to stop English army coming to free the city).
From Porta Docciola to Porta dell'Arco is a door-to-door sketchwalk that I made in Volterra with a Moleskine Japanese, before my last summer urban sketchers workshop (more drawings here). The city is built on a cliff and its medieval gates, fortress and walls are still intact, wooden doors included. Lots of tourists visit it at any time of the year but it is still possible to meet locals and listen at interesting conversations. I reported a few old people chatting, I love to hear their stories.