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.