The Great North Road, a feat of convict engineering
Only 43km of the road remains unchanged from the time it was built.
Sydney is also home to the Hyde Park Barracks and the Cockatoo Island Convict Site, both for the incarceration of convicts.
The Great North Road is one of Australia’s 18 World Heritage Sites.
The Greater Blue Mountain region covers one million hectares – around half the size of Wales.
The Great North Road is 250 kilometres long and took more than ten years to build.
Thirteen percent of the world's eucalyptus exists in the Greater Blue Mountains area.