Catania’s Roman theater is not the most famous on an island full of famous theaters: Segesta, Taormina, Syracusa. But at Catania the tunnels of the cavea, as you can see here, are virtually intact, and not just one set but three of them. You don’t have that at any of the other Sicilian theater sites.  When you visit Catania’s theater, you get a bonus since the ancient Odeon is right beside it. They’ve also preserved an 18th century house which was built atop the ruins, and you can visit that as well.