aft after-decks anchorage anchored crew cruise cruise ship decks dock docked docking harbor harbour heights high levels luxury luxury cruise observers observing ocean liner passenger ship passengers pier protection railing rails rear safety ship spectators stern tiers tourism tourists viewing decks views wharf anchor bow chinese cultural culture decorated decorative historic ornamental perspectives symbol symbolic tourist ship war-ship angled angles Australia climb climbing constructed construction curve curved curves danger dangerous deoxyribonucleic-acid DNA-double-helix-molecule DNA-Tower double double-helix handrails height helices helix helixes Kings-Park lookout lookout-tower park Perth platform public- park skywards spiral spiral-staircases spiraling spiralling staircases steel strength strong structure top tower towering turning view viewing-decks Western-Australia