Sister Bridges: Golden Gate Bridge, San Francisco; Ponte Vecchio, Florence; and Sydney Harbour Bridge.
Sydney has sister city relationships with six cities - San Francisco, USA; Nagoya, Japan; Wellington, New Zealand; Portsmouth, England; Guangzhou, China; and Florence, Italy. I have been fortunate enough to visit two of these cities - San Francisco and Florence, both of which have famous bridges.
(Apologies for the poor quality of the first two photos. They were taken in the predigital era.)
Please visit my fellow Sydney bloggers, Julie and Sally, to see which of Sydney's sister cities they have chosen.
To see sister cities around the world have a look at City Daily Photo.