Sydney Harbour Bridge opened in 1932 as the world's widest long-span arch bridge. Its 503-metre span earned it the affectionate nickname "the coat hanger". Building pillars was impossible: the harbour runs more than 50 metres deep and towers would have blocked large vessels. So the arch was the only solution.

Construction employed thousands during the Great Depression. The excitement as the two halves climbed skyward and finally met was vivid enough to inspire paintings by Grace Cossington-Smith. The bridge unified Sydney's northern and southern shores for the first time, transforming the city permanently.

VoiceMap's self-guided audio tours trace that transformation, connecting the bridge to the working-class history of The Rocks in its shadow, the Aboriginal flag flying from its arch, and the convict island of Fort Denison visible from the walkway, placing a famous landmark within the broader story of how Sydney was made.