The Eiffel Tower was built to celebrate the 100th anniversary of the French revelation. And Gustave convinced them not to tear the tower down by saying it could be used for scientific things like radio signals. It grows because it is made of wrought iron so when it's heated it " grows". When I first saw the Eiffel Tower I was amazed! It was so beautiful, I couldn't believe my eyes. I took so many photos that my memory got full ! And to think they want to tear it down! It is marvelous! I just LOVE it!