Rocky Hill War Memorial opened in 1925 as a lasting tribute to the men and women of Goulburn who served during the Great War (WWI). A small museum opened in the basement of the tower in 1927 to house a substantial collection of war trophies allocated to Goulburn in 1920s.
The museum remained open to the public throughout the twentieth century with the collection growing significantly since that time. In 1999, the entire collection was moved into the re-purposed care-takers cottage. A new state of the art museum building opened alongside in June 2020.