Barcelona Aquarium: Entry Ticket

Barcelona Aquarium sits at Port Vell on the city's old harbor and holds one of Europe's largest collections of marine life, anchored by an 80-meter underwater tunnel that lets visitors walk beneath sharks and rays swimming overhead. It's a reliably popular family attraction rather than a headline city sight, which shows in its moderate must-see and culture scores. A two-hour visit suits a morning or early afternoon slot, and its central, waterside location makes it one of the easiest add-ons to a Barcelona itinerary.