Bobby Leach used a steel barrel, also known as a plug (pictured), to go over Horseshoe Falls, the largest of Niagara's three waterfalls, in 1911. Courtesy of Jacob Sherman | Via Castellani Art Museum ...
This Sunday, daredevil Nik Wallenda -- who famously traversed Niagara Falls on a tightrope last year -- will attempt another extreme balancing act: walking a tightrope over the Grand Canyon. Wallenda ...
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