This is the grotto of Tiberius (r. 14-37 CE) at Sperlonga, on the western coast of Italy. From what we can gather, it was like a private entertainment venue for the emperor. Just outside of the actual grotto was a small “island” which contained a small dining area and a fish-farm of sorts. That way, the emperor could always have a fresh meal when entertaining.
Think about this grotto as a tunnel of love or some other sort of carnival attraction. To access the grotto (and the dining area, for that matter), you’d need to row around in a tiny boat. Inside the grotto was a great display of statues which depicted important scenes from the epics we all know and love. Archaeologists were able to piece together one such scene from The Odyssey, the one where wily Odysseus and his crew set up to blind the cyclops, Polyphemus. Another scene depicted Scylla massacring Odysseus’s crew. That one was a lot harder to put back together.
Portions of these statues remained in situ for millennia since the actual structure of the grotto collapsed (while Tiberius was present, too!). I wonder what the gods were trying to tell him…
Sasha’s side note: The city’s current name, Sperlonga, comes from the Latin word for “cave” (spelunca, -ae). Seems fitting, doesn’t it?