The legendary Niagara Falls straddles the border between the US and Canada, but it's the Canadian side that (arguably) offers the most thrilling views thanks to the picture-perfect curve of Horseshoe Falls (pictured). Visitors can get a good look at the falls from just about anywhere along the waterfront. The best way to take in one of the world's most spectacular sights, though, is on a helicopter ride or boat cruise, or from the high-perched observation deck at Skylon Tower.

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