The Universal Exposition of 1889, which also took place on the Champ de Mars, celebrated the centenary of the beginning of the French Revolution. The most memorable feature was the Eiffel Tower, 300 meters tall when it opened (now 324 with the addition of broadcast antennas), which served as the gateway to the Exposition. [159] The Eiffel Tower remained the world's tallest structure until 1930,[160] It was not popular with everyone: its modern style was denounced in public letters by many of France’s most prominent cultural figures, including Guy de Maupassant, Charles Gounod and Charles Garnier.