6650 Niagara Parkway, Niagara Falls, ON, Canada
https://www.niagaraparks.com/visit/attractions/journey-behind-the-falls
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To stand at the heart of Niagara, you’ll first need to descend 125 feet and explore 130-year-old tunnels through the bedrock, but you’ll feel the thunderous vibration of the Horseshoe Falls long before you see them.
The observation deck at the foot of this 13-storey-tall wonder will leave you breathless (and maybe a little bit wet), but don’t forget the viewing portals cut straight through the rock, offering a once-in-a-lifetime view of one-fifth of the world’s fresh water crashing down in front of you.