Tightrope walker crosses Niagara Falls

No wonder high-wire artist Nik Wallenda was on cloud nine.

His careful steps merged into a giant leap into the history books as he became the first person ever to walk across Niagara Falls on the tightrope.

Wallenda walked across the roaring waters of Horseshoe Falls, the largest of the three falls at 1,800ft, watched by an estimated 112,000 people.