Eiffel Tower 🗼
The Eiffel Tower (Tour Eiffel) was designed by engineers Maurice Koechlin and Emile Nouguier under Gustave Eiffel's firm and built from January 28, 1887 to March 31, 1889 for the Exposition Universelle marking the 100th anniversary of the French Revolution. Standing 330 meters (1,083 feet) tall (including its antenna), it was the world's tallest structure for 41 years until the Chrysler Building (1930). Made of 18,038 puddled iron pieces held by 2.5 million rivets, weighing 10,100 tons, it expands up to 15 cm in summer heat. Initially criticized by Parisian artists (Maupassant dined daily inside it to avoid seeing it), it was meant to be dismantled after 20 years but saved for radiotelegraphy use. Today it welcomes about 7 million visitors annually, the most-visited paid monument in the world.