Eiffel Tower:

The symbol of Paris, the Eiffel Tower is one of the world's most famous landmarks. This feat of ingenuity is a structure of 8,000 metallic parts, designed by Gustave Eiffel as a temporary exhibit for the World Fair of 1889. Originally loathed by critics, the 320-meter-high tower is now a beloved and irreplaceable fixture of the Paris skyline. The structure's unique gracefulness has earned it the nickname of "Iron Lady." Visitors are impressed by the tower's monumental size and the breathtaking panoramas at each of the three levels. 

Eiffel tower was initially criticized by some of France's leading artists and intellectuals for its design, but it has become a global cultural icon of France and one of the most recognizable structures in the world.The Eiffel Tower is the most-visited paid monument in the world; 6.91 million people ascended it in 2015.

The tower is 324 meters (1,063 ft) tall, about the same height as an 81-store building, and the tallest structure in the 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 man made structure in the world, a title it held for 41 years until the Chrysler building in the Newyork city was finished in 1930. 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 metres (17 ft). 

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 (elevator) to the first and second levels. The climb from ground level to the first level is over 300 steps, as is the climb from the first level to the second. Although there is a staircase to the top level, it is usually accessible only by lift.