The 12th annual Sydney Architecture Festival invites Sydneysiders to get behind some of our most iconic buildings and ask: what makes a building truly great? 2018 is a supernova for milestones in Australian architecture. With major anniversaries for the Sydney Opera House and Australia’s Parliament House coinciding with plans for their future, this year’s Festival looks at our opportunity to preserve, protect and renew the enduring legacy of these modern monuments for future generations.