You can't talk about the Sydney Harbour Bridge without mentioning Sydney Opera House, of course. They are, I think, the most significant landmarks of Australia, and just like the Eiffel Tower of Paris, the sight of them makes you feel glad you're alive.
2012: I was in Sydney for a week, on my 2-week trip in Aussie.
You can pay to climb the bridge, or go on a cruise to see the bridge from the water, but I could afford neither, so this was the best I could do.