Sydney Tower, Sydney, NSW, Australia. Sydney Tower is Sydney's tallest free-standing structure, and the second tallest in Australia. The Q1 building on the Gold Coast is the tallest. It is also the second tallest observation tower in the Southern Hemisphere. Auckland's Sky Tower is taller, though Sydney Tower Eye's main observation deck is almost 50 metres higher than Auckland Sky Tower's observation deck. The Tower's plans were unveiled in 1968 and construction of the tower itself was begun in 1975. It was opened to the public in 1981.
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