 It was added to the Queensland Heritage Register on 21 October 1992.The town was the headquarters of the 1891 Australian shearers' strike and the tree was the site of the 1892 reading of the Labour Party manifesto leading to the formation of the Australian Labor Party (ALP).The Tree of Knowledge was a ghost gum located in front of the Barcaldine railway station under which the workers of the 1891 Shearer's Strike met.