4Niagara Falls, New York
Listed as one of the most dangerous and most beautiful falls, Niagara Falls is also one of the most famous official Natural Wonders of the World. It straddles Canada and the USA. Take the Hornblower Cruise or hop on the Maid of the Mist for a closer, wetter look at the 3,100+ tons of water that rush over the falls every second.
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