Top 2 unkown facts about Eiffel tower😮

1* The height of the Eiffel tower is grown every summer. Eiffel tower is made from metal, and due to extreme heat in summer, the base metal of the Eiffel tower expands approx. At 6 inches.

  2*  The paint used to paint the Eiffel tower has an equal weight of about 10 Elephants. After every seven years, the Eiffel tower is painted.

 Some basic about the Eiffel tower :

Locally nicknamed "La dame de fer" (French for "Iron Lady"), it was constructed from 1887 to 1889 as the entrance to the 1889 World's Fair and was initially criticized by some of France's leading artists and intellectuals for its design. Still, it has become a global cultural icon of France and one of the most recognizable structures in the world.[3] The Eiffel Tower is the most-visited paid monument globally; 6.91 million people ascended it in 2015.

The tower is 324 meters (1,063 ft) tall, about the same height as an 81-story building, and the tallest structure in Paris. Its base is square, measuring 125 meters (410 ft) on each side. During its construction, the Eiffel Tower surpassed the Washington Monument to become the tallest artificial structure globally, a title it held for 41 years until the Chrysler Building in New York City was finished in 1930. It was the first structure to surpass both the 200 meters and 300-meter mark in height. Due to the addition of a broadcasting aerial at the top of the tower in 1957, it is now taller than the Chrysler Building by 5.2 meters (17 ft). Excluding transmitters, the Eiffel Tower is the second tallest free-standing structure in France after the Millau Viaduct.

The tower has three levels for visitors, with restaurants on the first and second levels. The top level's upper platform is 276 m (906 ft) above the ground – the highest observation deck accessible to the public in the European Union. Tickets can be purchased to ascend by stairs or lift to the first and second levels. The climb from ground level to the first level is over 300 steps, as is the upgrade from the first level to the second. Although there is a staircase to the top level, it is usually accessible only by lift.

The design of the Eiffel Tower is attributed to Maurice Koechlin and Émile Nouguier, two senior engineers working for the Compagnie des Établissements Eiffel. It was envisioned after a discussion about a suitable centerpiece for the proposed 1889 Exposition Universelle, a world's fair to celebrate the centennial of the French Revolution. Eiffel openly acknowledged that inspiration for a tower came from the Latting Observatory built in New York City in 1853.[4] In May 1884, working at home, Koechlin sketched their idea, described by him as "a great pylon, consisting of four lattice girders standing apart at the base and coming together at the top, joined together by metal trusses at regular intervals."[5] Eiffel initially showed little enthusiasm, but he did approve of further study. The two engineers then asked Stephen Sauvestre, the head of the company's architectural department, to contribute to the design.

Sauvestre added decorative arches to the tower's base, a glass pavilion to the first level, and other embellishments. The new version gained Eiffel's support: he bought the rights to the patent on the design which Koechlin, Nougier, and Sauvestre had taken out, and the design was exhibited at the Exhibition of Decorative Arts in the autumn of 1884 under the company name. On 30 March 1885, Eiffel presented his plans to the Société des Ingénieurs Civils; after discussing the technical problems and emphasizing the practical uses of the tower, he finished his talk by saying the building would symbolize:

[n]ot only the art of the modern engineer, but also the century of Industry and Science in which we are living, and for which the way was prepared by the great scientific movement of the eighteenth century and by the Revolution of 1789, to which this monument will be built as an expression of France's gratitude.[6]

Little progress was made until 1886 when Jules Grévy was re-elected as president of France, and Édouard Lockroy was appointed as minister for trade. A budget for the exposition was passed and, on 1 May, Lockroy announced an alteration to the terms of the open competition being held for a centerpiece to the show, which effectively made the selection of Eiffel's design a foregone conclusion, as entries had to include a study for a 300 m (980 ft) four-sided metal tower on the Champ de Mars.[6] (A 300-meter tower was then considered a herculean engineering effort). On 12 May, a commission was set up to examine Eiffel's scheme and its rivals, which, a month later, decided that all the proposals except Eiffel's were either impractical or lacking in details.

After some debate about the exact location of the tower, a contract was signed on 8 January 1887. This was signed by Eiffel acting in his capacity rather than as the representative of his company and granted him 1.5 million francs toward the construction costs: less than a quarter of the estimated 6.5 million francs. Eiffel was to receive all income from the commercial exploitation of the tower during the exhibition and for the next 20 years. He later established a separate company to manage the building, putting up half the necessary capital himself.[7]