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18 of 35 from The Eiffel Tower, behind the scenes (photos)
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This is a photograph of a historical picture of the Eiffel Tower showing what are called the foundation caissons, essentially waterproof metal cages that made it possible to construct the tower's foundation adjacent to the famous Seine River of Paris.
June 26, 2011 4:00 AM PDT
Photo by: Daniel Terdiman/CNET
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