The Princess Royal Fortress was opened in 1893 as the first federal defence of Australia. In 1956, coastal defences like the Princess Royal Fortress were decommissioned. The fort now has restored shore batteries, armouries, barracks, the 10th Light Horse display, trails and a collection of naval guns and torpedoes. The fort is also home to the SE Asia Memorial, US Submariners Memorial and Merchant Navy Memorial. A fascinating place to visit with historical significance.