High wire performer Nik Wallenda practices Tuesday, June 18, 2013...

High wire performer Nik Wallenda practices Tuesday, June 18, 2013 in Sarasota, Fla. Wallenda, a seventh generation high-wire walker, will attempt to walk across the Grand Canyon on Sunday, June 23, 2013. Credit: AP / Chris O'Meara

Aerialist Nik Wallenda, who walked a tightrope between Chicago skyscrapers on Sunday, says he is already planning his next daredevil stunt.

"I'm working on re-creating my great-grandfather's greatest walk, which was over Tallulah Gorge, Georgia -- 600 feet high, 1,000 feet long," Wallenda, 35, a seventh-generation member of The Flying Wallendas, said on the "Today" show Monday.

"He did two headstands on the wire. I've never done a headstand on the wire in public, and I'm training for that. I want to re-create that walk."

Karl Wallenda, the troupe's founder, traversed the Tallulah Gorge on July 18, 1970, at age 65.

Discovery Channel said yesterday that "Skyscraper Live With Nik Wallenda" averaged 5.82 million viewers to become the network's most-watched telecast of the year, although viewership fell far short of his "Skywire" stunt over the Grand Canyon last year, which attracted 13 million viewers.

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