The Ear of Dionysius is an artificial cave cut into the limestone cliffs of the Neapolis Archaeological Park, 23 metres high and 65 metres deep, with an S-shaped interior that produces extraordinary acoustic effects. Speak in a whisper anywhere inside and your voice is amplified to a shout — an effect that was almost certainly intentional, whether for the theatrical, religious, or surveillance purposes that various historians have proposed.
The cave is one of four latomie — ancient quarries — that supplied the stone for classical Syracuse. The other three have been partially turned into gardens; the Ear is the most dramatic single feature. Inside the park, follow the path from the entrance past the Greek Theatre to find the cave entrance, which opens in the cliff face below the theatre.