1. Niagara Falls, Ontario: 12 to 14 million

The legendary falls cracked the top 10 of our U.S. tourist attraction list, and it's no surprise that Niagara Falls ranks as a top Canadian draw as well. The thundering waters straddle the two countries' borders, and it's tricky to parse out which nation's soil the viewers appreciate the Falls from—it's often both (The Niagara Falls Bridge Commission estimates 12 million annual cross-border passages on its bridges). Numbers from Niagara Falls Tourism (Canada) and the City of Niagara Falls, Ontario put the figure, respectively, at 12 and 14 million a year.

SOURCES: City of Niagara Falls and Niagara Falls Tourism