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He will walk between Chicago skyscrapers Sunday.
Nik Wallenda to walk on a wire between Chicago skyscrapers.
Enter the scariest haunted house in New York City.
Set to compete in inaugural Red Bull event.
The mentally weak need not apply.
Red Bull's latest twist to supercross.
Your favorite hobby is actually a kick-ass cardio workout.
10 epic photos from the GoPro Mountain Games.