The Eiffel Tower with its nickname La dame de fer(iron lady) is a puddle iron lattice tower located on the Champ de Mars in Paris. Built in 1889, it has become both a global icon of France. The tower is the tallest building in Paris and the most visited paid monument in the world. Named for its designer, engineer Gustave Eiffel.
The tower stands 324 meters. It held for 41 years. The tower has three levels for visitors. Tickets can be purchased to ascend by stairs or lift, to the first and second levels. The walk to the first level is over 300 steps as is the walk from the first to the second level. The third and highest level is accessible only by elevator. Both the first and second levels feature restaurants.
The pig iron structure of the Eiffel Tower weighs 7,300 tonnes while the entire structure, including non-metal components, is approximately 10,000 tonnes. As a demonstration of the economy of design, if the 7,300 tonnes of the metal structure were melted down it would fill the 125 metre square base to a depth of only 6 cm (2.36 in), assuming the density of the metal to be 7.8 tonnes per cubic metre. Depending on the ambient temperature, the top of the tower may shift away from the sun by up to 18 cm (7.1 in) because of thermal expansion of the metal on the side facing the sun.
RESOURCE: http://en.wikipedia.org/wiki/Eiffel_Tower
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