Live US tightrope walks successful Nik Wallenda will perform two walks between skyscrapers without a net or harness in Chicago. NIK Wallenda has successfully completed his two skyscraper tightrope walks in Chicago in a spectacle televised to an audience of millions around the world. THE 35-year-old daredevil first walked a high wire on Sunday night at a 19-degree incline from the Marina City west tower to the top of a building on the other side of a river. He then walked blindfolded between the two Marina City towers without using a net or harness. Wallenda's previous feats include high-wire walks over the brink of Niagara Falls and across the Little Colorado River Gorge. Wallenda is the great-grandson of Karl Wallenda, who fell to his death during a tightrope stunt in Puerto Rico at age 73.