Champ-de-Mars(shäN-də-märs), former parade ground of Paris, France, between the École militaire and the Seine River. There, at the Fête de la Fédération (July 14, 1790), Louis XVI took an oath to uphold the new constitution. On its vast grounds several expositions were held, notably that of 1889, when the Eiffel TowerEiffel Tower,
structure designed by A. G. Eiffel and erected in the Champ-de-Mars for the Paris exposition of 1889. The tower is 984 ft (300 m) high and consists of an iron framework supported on four masonry piers, from which rise four columns uniting to form one shaft.
..... Click the link for more information. was erected there.