Princess Royal Fortress, Fortress museum on Mount Adelaide in Albany, Australia

Princess Royal Fortress occupies about 11 acres on the northern shore of the Atatürk entrance on Mount Adelaide, overlooking King George Sound. Two gun batteries were dug into the hillside: Fort Princess Royal with two 6-inch Mark IV guns and Fort Plantagenet with one 6-inch gun. Around the parade ground stand the Military Institute, Guard House, Barracks and Repository Store, with an underground magazine, ruins and transported buildings elsewhere on the sloping site.

This fortress was established in 1893 as the first joint defense project between Australian colonies, with Britain supplying the artillery equipment. The site was built to protect the coast from potential naval threats of that era.

The National Anzac Centre opened on 1 November 2014, the centenary of the first Australian and New Zealand convoy's departure from Albany. It was built for A$10.65 million and inaugurated by Prime Ministers Tony Abbott and John Key. In 2015 it was named the state's best Heritage Tourism Project at the Western Australian Heritage Awards.

The site sits on Mount Adelaide above King George Sound, with the parade ground at its centre and the Military Institute, Guard House, Barracks and Repository Store grouped around it; other buildings follow the slope of the hill. Two guns remain in their original positions, alongside an underground magazine and ruins. The National Anzac Centre opened here on 1 November 2014.

Two gun batteries are carved directly into the hillside of Mount Adelaide and originally housed British Mark IV 6-inch guns. These underground structures show the engineering skill that went into building this early coastal defense.