This is another superb viewpoint on top of an ancient volcanic rock. You can look down the west coast of the peninsula as far as Miseno and beyond to Ischia. Up the coast you can see the traces of a 200 kilometre long canal, which the Romans built from Pozzuoli to Rome, to avoid the storms and pirates that afflicted sea travel. There’s a lot to see on the rock itself as well, although many of the signboards have been smashed or defaced. You can climb up along an ancient sacred way to the old Greek ruins on top of the rock, or wander around the more comfortable Roman town at its base.
This was the oldest Greek colony in Italy and a major religious centre. At the side of the rock, only re-discovered in the mid-20th century, is the cave of the Sibyls, a long trapezoid gallery running under the side of the hill, with alcoves for light (and sound) along one side. The acoustics are startling, magnifying every sound the pigeons make as they blunder into their holes. The sibyl sat at the far end, over fumes from a sacred fire, uttering prophesies for the people gathered outside, listening at the light wells.