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The metal structure of the Eiffel Tower has a mass of 7300 tons, or 7.3 million kilograms. The design of the tower is very space-efficient: if you melted down the pure iron* that it is made of, it would occupy a volume of only 930m3, equivalent to a sphere with a radius of just six metres.
The Eiffel Tower represents engineering, architecture, and the city of Paris, although when it was built it was meant only to be the entrance to the Exposition Universelle, or World's Fair. The Eiffel Tower opened in March, 1889. It is approximately 10,000 feet tall and was the tallest structure in the world until 1930.