The world's top 10 bridges

Bridges have conquered civilizations, connected races and brought cultures into contact and conflict. At their simplest, however, they have enabled human beings (and animals) to explore and discover land masses separated by great, intractable bodies of water. Consider for heft London's iconic Tower Bridge and the imposing Sydney Harbour Bridge, or for tasteful architecture the exquisitely beautiful Pont Alexandre III in Paris and Ponte Vecchio Bridge in Florence. Take a look at the top 10 and feel free to argue.