The Messina waterfront is where the city's identity comes into focus. You can stand at the edge and see Calabria — mainland Italy — just 3km across the water, the closest Europe gets to being two countries separated by nothing more than a narrow channel. The ferries crossing back and forth make it vivid: this is one of the busiest short crossings in the Mediterranean, and watching the traffic says more about Messina's transit role than any amount of explanation.
The seafront promenade along the Viale della Libertà is pleasant for a walk, particularly at the golden hour before sunset when the light on the Calabrian hills across the water can be spectacular. The Piazza della Repubblica and the areas around the ferry terminal have the civic energy of a port city that actually works rather than performing for tourists. It's worth walking the length of the waterfront to understand the shape of the city — long and thin, pressed against the strait — and to appreciate the memorial piazza where the LaFenice sculpture commemorates victims of the 1908 earthquake. The strait itself has its own mythology: this is the Scylla and Charybdis of Homer's Odyssey, the narrow channel where whirlpools and currents made navigation treacherous for ancient sailors.