Luc-Antoine Couturier/Québec City
The only remaining walled city in the Americas north of Mexico, Québec City is like a museum within itself. One of North America's oldest cities, Quebec City is perched atop the cliff-like Cap Diamant and overlooks the scenic St. Lawrence River. With its split level landscape, the town reflects four centuries of history. It was founded in 1608 by French explorer Samuel de Champlain who established a colony in what's now the Lower Town, but the French colony later fell to the British in 1759 following a fierce 20-minute battle on Upper Town's Plains of Abraham.