To me, no other place in Montréal represents the city better than Place d'Armes.
After all, it is the second oldest public site in the city, and its center is home to a statue of Paul de Chomedey, the founder of Montréal. And the varied architectural styles surround the square in a way that clearly demonstrates just how old and historic Montréal is. A blend of Gothic Revival, classic Art Deco, and ultra-modern sleek skyscrapers illustrates the major periods of Montréal's development.
It's definitely a great place to start or end an Old Montreal exploratory tour, or to stop and people watch!
