Europe’s largest aquarium is Genoa’s biggest draw and a must-see for travelers with children. The structure alone is remarkable, resembling a ship and built alongside a pier in the old harbor; it’s about a 15-minute walk from Stazione Principe and 10 minutes from Via Garibaldi. Inside, more than 50 aquatic displays re-create Red Sea coral reefs, pools in the tropical rainforests of the Amazon River basin, and other marine ecosystems that provide a pleasant home for sharks, seals, dolphins, penguins, piranhas, and just about every other known kind of creature that has lived in the sea, lakes, or near a major river. Look out for the tiny orange frogs from Madagascar the size of a thumbnail. During the day, playful seals and dolphins blow trick bubbles. Descriptions are posted in English, and there’s a 3-D film on ocean life (ask for printed English narration).