More than 100,000 people gathered to watch the feat, which has taken more than two years and help from many people, including NASA engineers, to accomplish.

Nik Wallenda is a descendant of the famous "Flying Wallendas" family of acrobats.

The stunt was incredible, not just because no one has ever done it before but because it took a lifetime of training and a lot of physical and mental strength to perform.

Niagara Falls creates a lot of mist, which drenched Wallenda most of the time he was on the tightrope. Swirling winds threatened to knock him from his perch, 200 feet in the air above the thundering falls.

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