Calatrava's whale-skeleton of a science museum is hands-on across three floors — biology, physics, technology, plus a long ribbon of interactive experiments aimed at children but happily commandeered by adults. The pendulum demonstration, the climbing wall built to teach basic physics, and the rotating space exhibit are the standouts.
Allow at least two hours. Entry is separate from the Oceanogràfic, but combined tickets are available. The exterior — a fish-skeleton ribcage of white concrete and glass under a dramatic 220-metre arched roof — is worth circling even if you don't go in.