The Eiffel Tower is an iron tower built on the Champ de Mars beside the River Seine in Paris. The tower has become a global icon of France. The Parisian landmark is the tallest structure in Paris and one of the most recognized structures in the world. Named after its designer, engineer Gustave Eiffel, 6,719,200 people visited the tower in 2006 and more than 200,000,000 since its construction. This makes the tower the most visited paid monument in the world per year. Including the 24 m (79 ft) antenna, the structure is 324 m (1,063 ft) high (since 2000), which is equivalent to about 81 levels in a conventional building.
At the time of its construction in 1887, the tower replaced the Washington Monument as the world's tallest structure, a title it retained until 1930, when New York City's Chrysler Building (319 m — 1,047 ft tall) was completed. The tower is now the fifth-tallest structure in France. The Eiffel Tower is the tallest structure in Paris, with the second-tallest being the Tour Montparnasse (210 m — 689 ft), although that will soon be surpassed by Tour AXA (225.11 m — 738.36 ft).
The structure of the Eiffel Tower weighs 7,300 tons. Depending on the ambient temperature, the top of the tower may shift away from the sun by up to 18 cm (7 in), due to thermal expansion of the metal on the side facing the sun. The tower also sways 6-7 cm (2-3 in) in the wind.
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