Although, the erection of the Eiffel tower was not very popular in the 19th century, it has become "The" symbol of Paris. It seems you cannot leave Paris without visiting it.
Gustave Eiffel's was chosen among 700 architects and engineers to build the tower that would commemorate the 100th anniversary of the French Revolution. This 300 meters high tower was the tallest building till 1930. There are several figures of this tower that would surprise you. Did you know that its height varies up to 15 cm depending on temperature?