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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.
According to Wikipedia (http://en.wikipedia.org/wiki/Eif...), the Eiffel Tower is 324 meters or 1,063 feet tall. For comparison, the tallest building in the world is the Burj Khalifa at 828 meters or 2,717 feet tall.