A new $9.5 million stretch of walking track is now open in Sydney Harbour National Park. The 3km path, linking Middle Head–Gubbuh Gubbuh and Georges Head, includes a collection of restored defence structures dating from 1801 to the Vietnam War. Walkers can see World War II twin 6-pounder gun casemates and military fortifications such as the Inner and Outer Defensive Ditches, which were carved around the headland to protect fortifications from land-based attacks. It provides a missing link betwee