Tzannes designed the Federation Pavilion in Centennial Park, New South Wales, which was erected around the Commonwealth Stone as a permanent monument to Australia's Federation, in the Bicentennial Year of European Settlement in 1988. The Federation Monument which consists of the Commonwealth Stone (1901) and the Federation Pavilion (1988) is significant as the site of the official ceremony to mark the Federation of Australia and the inauguration of the Commonwealth of Australia on 1 January 1901.