Driving across the Sydney Harbour Bridge on the Bradfield Highway looking up at the steel arch span.
At 500 metres, it is one of the longest steel arch bridges in the world. It's still one of the tallest steel arch bridges in the world at 134 metres above mean sea level. Interestingly, its height is increased by about 7cm on very hot days as the steel expands.
Built in 1932, the bridge is still going strong, carrying four railroad tracks, the highway and two pedestrian walkways.
The highway, one of the shortest in Australia, is named after John Bradfield, a civil engineer with the then NSW Department of Public Works who in 1912 first proposed and designed the bridge, and then headed the project to build the bridge linking Sydney with its northern suburbs.
