The Eiffel Tower is a wrought-iron lattice tower on the Champ de Mars in Paris. It is named after the engineer Gustave Eiffel, whose company designed and built the tower. It was constructed from 1887 to 1889 as the entrance to the 1889 World's Fair and was initially criticised 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 recognisable 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 metres tall, about the same height as an 81-storey building, and the tallest structure in Paris. Its base is square, measuring 125 metres on each side. It was the first structure in the world to surpass both the 200 meter 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 metres. 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 above the ground – the highest observation deck accessible to the public in the European Union. 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.(Wikipedia)