London Arch, Port Campbell National Park, Victoria, Australia

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London Arch is a natural arch on Victoria's coast that was formed by erosion, as were the more famous Twelve Apostles and other formations. Before 1990 this formation was a complete double-span natural bridge, with one of the two spans connected to the shoreline. It was then named London Bridge because of the similarity to its namesake. The arch closer to the shoreline collapsed unexpectedly on January 15, 1990, leaving two tourists, who were later rescued by helicopter, stranded on the remaining span.