Daredevil Nik Wallenda is breathing a sigh of relief after completing a record tightrope walk between two Chicago skyscrapers -- while blindfolded. The first leg of the stunt had Wallenda walking up an incline on a tightrope from the Marina City West Tower, across the Chicago River, to the Leo Burnett building. After walking at street level back to the Marina City West Tower, he began the second and blindfolded leg over to the East Tower.