Grotta di Cocceio
About
Roman engineers bored this tunnel nearly a kilometer through Monte Grillo to link Lake Avernus with Cumae, wide enough for two wagons to pass side by side. Agrippa commissioned the work around 37 BCE while converting Avernus into a hidden naval harbor for the war against Sextus Pompeius. Six vertical shafts pierced the hillside for daylight and air, the tallest running more than 30 meters straight up through solid rock. The fleet moved on to Misenum decades before 117 CE, but the tunnel stayed open and in everyday use long after its military purpose had passed.
What happened here
It was put up to be argued with. Public monuments carry an inscription at eye height naming who paid, what for, and by whose authority, because being read is the whole return on the investment. People meet at them, give directions by them, and shelter under them. Children climb them. The bronze fittings are stolen often enough that they are re-attached with lead. On anniversaries the base is garlanded and the local council makes a short speech nobody listens to. Monuments also date the town for you: a run of them along one street shows which families were rising in which decade, and which ones stopped. When a family falls out of favour, the name is chiselled out and the stone is quietly reused.
Sources
Nearby
Roman Maps shows the empire frozen at 11 August 117 CE, the day Trajan died — its moment of greatest territorial extent. Explore the full map →