The Eiffel Tower is located in Paris, France and was the tallest structure in the world when completed in 1889. It was built by Gustave Eiffel as the entrance to the 1889 World's Fair and demonstrates structural engineering innovations. The tower is 300 meters tall and constructed of iron with a geometric shape consisting of triangles, parallelograms, and arches. It has three observation platforms and remains a prominent symbol of Paris that is used for radio/television broadcasting.