With no net to catch him if he fell, the nine-time Guinness World Record holder walked across a 1,576-foot wire that was stretched more than 10 stories above the Milwaukee Mile Speedway at the fairgrounds, TMJ reports.
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“This walk, the biggest challenge is endurance. It's a long walk. That's a long distance to walk,” Wallenda, 36, said before his stunt, according to WISN.
Wallenda grew up performing with the Flying Wallendas and has gained worldwide attention for crossing a wire strung between famous landmarks, including the Grand Canyon, Niagara Falls and two Chicago skyscrapers – he was blindfolded for part of that one.
Next up for Wallenda may be a wire walk over an active volcano, or perhaps something involving the Egyptian pyramids, reports note.