The southern tower of Saint-Sulpice was designed by Oudot de Maclaurin. The northern tower was designed by Jean-François Chalgrin, and is thus quite different. The southern tower was never finished, for lack of funds, and because of the French Revolution.
Take a look at the pictures I’ve taken on trips to Italy
See the pictures I’ve taken in the United States
Take a look at the photographs I’ve taken in Canada