Eiffel Tower

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The Eiffel Tower is a puddle iron lattice tower located on the Champ de Marsin Paris. Built in 1889, it has become both a global cultural icon of France and one of the most recognizable structures in the world. The tower is the tallest building in Paris and the most-visited paid monument in the world; millions of people ascend it every year. Named after its designer, engineer Gustave Eiffel, the tower was built as the entrance arch to the 1889 World's Fair.
The tower stands 324 metres tall, about the same height as an 81-storey building. During its construction, the Eiffel Tower surpassed theWashington Monument to assume the title of the tallest man-made structure in the world, a title it held for 41 years, until the Chrysler Building in
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The tower was much criticized by the public when it was built, with many calling it an eyesore. Newspapers of the day were filled with angry letters from the arts community of Paris. The pig iron structure of the Eiffel Tower weighs 7,300 tones, while the entire structure, including non-metal components, is approximately 10,000 tones. As a demonstration of the economy of design, if the 7,300 tones of the metal structure were melted down it would fill the 125-metre-square base to a depth of only 6 cm, assuming the density of the metal to be 7.8 tones per cubic meter. Depending on the ambient temperature, the top of the tower may shift away from the sun by up to 18 cm because of thermal expansion of the metal on the side facing the sun.
Maintenance of the tower includes applying 50 to 60 tones of paint every seven years to protect it from rust. The height of the Eiffel Tower varies by 15 cm due to temperature. In order to maintain a uniform appearance to an observer on the ground, three separate colors of paint are used on the tower, with the darkest on the bottom and the lightest at the top. On occasion the color of the paint is changed; the tower is currently painted a shade of bronze. On the first floor there are interactive consoles hosting a poll for the color to use for a future session of painting. The only non-structural elements are the four decorative grillwork arches, added in Stephen Sauvestre's sketches,
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