Inside the Orecchio di Dionisio (Ear of Dionysius). This ear-shaped man-made grotto is located in the Latomia del Paradiso (Garden of Paradise) within the grounds of the Neapolis Parco Archeologico in Syracuse, Sicily.
The cave is 23m high and 65m deep. In the 16th century the renaissance artist Caravaggio suggested that the Greek tyrant-king Dionysius (Dionysius I of Syracuse, circa 432–367 BC) had it constructed to listen in on the conversations of the prisoners (mostly political dissidents) working in the limestone quarry where the gardens now reside – though this seems unlikely. It has also been suggested that Dionysius had the grotto constructed to amplify the screams of prisoners being tortured in it.