The Sydney Harbour Bridge or Coat hanger as called by locals was the citys best-known landmark prior to construction of the Opera House. It is the main crossing of Sydney Harbour carrying rail, vehicular, and pedestrian traffic between the Sydney central business district (CBD) and the NorthShore. The dramatic water vista of the bridge together with the nearby Sydney Opera House is an iconic image of both Sydney and Australia. The South-east pylon for many years operated as lookout and tourist attraction.The bridge was built in 1932 and remains the worlds largest steel arch bridge, connecting the harbours north and south shores in a single curve rising 134 m above the water. Along its length run two railway lines and eight lanes for road traffic, the direction of which can be varied according to traffic flow.Pedestrians can stroll across on walkways or join a guided ascent through Bridge Climb for a breath-taking panorama of the city and harbour.