Grand Canyon tightrope walk: What was that huge pole for

Wallenda walks fine line high, high above river gorge - CNN

The Niagara Falls Tightrope Walker Cleared Customs - The Atlantic

Skywire Live - Wikipedia

Nik Wallenda's high-wire walk at the Calgary Stampede

Nik Wallenda, continuing family tradition, to walk tightrope across Niagara Falls Friday (video)

How old is the Grand Canyon? You might be surprised.

Tightrope

Nik Wallenda defies death with successful tightrope of 'Grand Canyon' - Men's Journal

The World's Most Controversial High-Wire Walker Has A Plan To Take Over Entertainment