The Eiffel Tower was the tallest structure on Earth.

From its debut at the 1889 World's Fair in Paris until the completion of the Chrysler Building in 1930, Gustave Eiffel's wrought-iron marvel represented the peak of human engineering. It's still the tallest landmark in the City of Light today at 984 feet, but pales in comparison to the current global record holder, the Burj Khalifa, which stands at 2,722 feet.