Sydney Tower (also known as the AMP Tower, AMP Centrepoint Tower, Centrepoint Tower or just Centrepoint) is Sydney's tallest free-standing structure, and the second tallest in Australia (with the Q1 building on the Gold Coast being the tallest). It is also the second tallest observation tower in the Southern Hemisphere (after Auckland's Sky Tower, though Sydney Tower's main observation deck is almost 50 m (164 ft) higher than that of Auckland's Sky Tower).