1 of 31: On June 15th, daredevil Nik Wallenda will walk approximately 1,550 feet on a tightrope wire, suspended 173 feet above the raging waters of Niagara Falls, between the United States and Canadian border - an unprecedented feat that has been banned for over 125 years. Wallenda's long-planned event will air live during a night of MEGASTUNTS specials starting with "Countdown to Niagara: The Greatest Megastunts of All Time" (8-9pm, ET) and will culminate with Wallenda's walk on "Megastunts: Highwire Over Niagara Falls - Live!" (9-11pm, ET) on FRIDAY, JUNE 15. (American Broadcasting Companies, Inc.)

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