A boat tour gives you a good perspective on the layout of the harbor, which dates to Roman times. The Genoa inlet, the largest along the Italian Riviera, was also used by the Phoenicians and Greeks as a harbor and a staging area from which they could penetrate inland to form settlements and to trade. The port is guarded by the Diga Foranea, a striking wall 5 km- (3 miles-) long built into the ocean. The Lanterna, a lighthouse more than 360 feet tall, was built in 1544; it's one of Italy's oldest lighthouses and a traditional emblem of Genoa.
Consorzio Liguria Viamare. Boat tours of the harbor, operated by the Consorzio Liguria Viamare, launch from the aquarium pier and last about an hour. The tours include a visit to the breakwater outside the harbor, the Bacino delle Grazie, and the Molo Vecchio (Old Port). There are also daily excursions down the coast as far as the Cinque Terre and Portovenere. Via Sottoripa 7/8, Porto
Vecchio, 16128. 010/265712. www.liguriaviamare.it. €6 for port tour, €33 and up for tours to Cinque Terre. Daily; departure times vary.