I would like to know more about the history of the Eiffel Tower. Your response should contain at least 200 words and at least 3 paragraphs. Use the markdown divider *** to separate paragraphs. Highlight at least 2 sections in your answer with markdown, i.e. *highlighted section*. Include keywords *Gustave Eiffel*, *World's Fair*, *Paris*. At the end of your response, please explicitly add a postscript starting with *P.S.*.

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