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 high 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
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