Nik Wallenda celebrates after walking a tightrope Sunday, Nov. 2, 2014 from Marina City to the Leo Burnett Building over the Chicago River. (Brian Cassella/Chicago Tribune)
Brian Cassella Nik Wallenda celebrates after walking a tightrope Sunday, Nov. 2, 2014 from Marina City to the Leo Burnett Building over the Chicago River. (Brian Cassella/Chicago Tribune)

The American tightrope walker successfully completed his controversial skywalk on Sunday, breaking two world records and defying critics who claimed the stunt was too dangerous to perform without a harness.

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