Niagara Falls
The Maid of the Mist approaching the Horseshoe Falls, Niagara Falls. Photo via Wikimedia Commons.
The city built around the famous falls, where the Niagara River plunges over the Niagara Escarpment on the Canada-US border. The Canadian side holds the best views of Horseshoe Falls, plus the Table Rock Welcome Centre, Hornblower cruises to the base, and the Journey Behind the Falls tunnels. Lit up at night, it is Canada's most visited natural attraction.