Paris, France
The Arc de Triomphe, Place de l'Étoile
Jean François Thérèse Chalgrin and completed by Guillaume Abel Blouet
begun 1806; completed 1833-36
The arch was commissioned by Napoleon as a tribute to the French army.
(Sorry, I already posted this on a previous page but do not dare to delete it in cas I am going to delete other replies as well.)