Description:Somehow the words, ‘Niagara Falls’ and ‘tightrope’ don’t seem to mix well together. One daring soul, Nik Wallenda doesn’t share that mentality as he is going to walk a tightrope over the raging Falls. The tightrope specialist holds 6 Guinness World Records, including one for the longest bicycle ride on a suspended wire without a safety net.(1:12)