20 October 1973 Posted on October 19, 2013 by Staff The Sydney Opera House is opened. Famous Words of Inspiration..."The greater our knowledge increases the more our ignorance unfolds." John F. Kennedy — Click here for more from John F. Kennedy Related posts: 20 October 1973 6 October 1973 17 November 1973 14 May 1973 21 July 1973 26 January 1788 4 February 2004 20 October 1967 23 October 2002 23 October 2002