Since the Eiffel Tower’s 1889 inauguration in Paris, over 300 million visitors have visited the 136-year-old iconic attraction. Historically designed to commemorate the centennial of the French Revolution, this structural wonder dominates the Parisian skyline today.

Back in the 19th century, the construction of this “Iron Lady” was no easy feat—60 tons of paint, 7,300 tons of iron, and 2.5 million rivets were used. Under the watchful eye of French architect Alexandre-Gustave Eiffel, it took two years, two months and five days for the structure to be completed.

The Eiffel Tower was practically a science lab. 72 names of French men (scientists, engineers, and mathematicians) are engraved on the sides of the tower under the first balcony in recognition of their contributions to the tower’s successful assembly. However, the list contains no women. It has been criticized for excluding the name of Sophie Germain, a noted French mathematician whose work on the theory of elasticity was used in the construction of the tower itself. It was said that Germain was excluded because she was a woman.

It’s painted mostly by hand. The Eiffel Tower is stripped of its color and repainted every seven years by 50 painters. To date, the tower has been repainted 19 times. On average, at least 60 tons of paint are applied to the whole structure to prevent the iron exteriors from rusting.

More Info: en.wikipedia.org