An 800-metre walkway spirals past displays of sea life from around the Pacific Ring of Fire, from Antarctic penguins to coral-reef butterflyfish and unreasonably cute Arctic otters. The centrepiece is an enormous central tank housing a whale shark, manta rays, and thousands of fish, viewed from different levels as you descend the spiral. The scale of this main tank is genuinely awe-inspiring, and the jellyfish room at the end casts a hypnotic, otherworldly spell.