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The Sydney Harbour Bridge is known as the first single span arch bridge in the world, a representative architecture in early Sydney history. This bridge, which had been designed in 1857 and had completed in 1932, was an important connector between the northern and southern part of the port(这段我不明白诶，什么叫连接港口南北两岸？）. Since 1998, the Sydney Harbour Bridge has been open for public to climb. The whole journey of climbing is very safe and it is the only bridge in the world that allows visitors to climb onto the top of its arch.